Fixed invalid link on starred projects dashboard.

Fixes #3468

The MR fixes 'Project' links on a dashboard pages headers. See the issue for the details.

This MR does not include tests since the change is rather trivial and there are no (as far as I have seen) existing tests for checking links validity.

In case tests are required I would like to get some guidance on the implementation first. At least I would like to know what should be covered: changed links, all header links, all navigation?

See merge request !1926

UI: Use new style for wiki

Depends on !1953

See the commits for more details, the messages mostly speak for themselves.

# Highlights

## Wiki Page

Before:

![Screen_Shot_2015-12-02_at_17.48.45](/uploads/aa53f768b8760f2e15d765e06d5ff773/Screen_Shot_2015-12-02_at_17.48.45.png)

After:

![Screen_Shot_2015-12-02_at_17.48.16](/uploads/f8a376651aff9c8de82621578aaeb002/Screen_Shot_2015-12-02_at_17.48.16.png)

## Edit Wiki Page

Before:

![Screen_Shot_2015-12-02_at_17.48.59](/uploads/c9ffddaca3156046b99cba11bdb0ea4f/Screen_Shot_2015-12-02_at_17.48.59.png)

After:

![Screen_Shot_2015-12-02_at_17.48.26](/uploads/1aa62049f120c91436ed68fd7441c156/Screen_Shot_2015-12-02_at_17.48.26.png)

See merge request !1967

UI: New Project form tweaks

Depends on !1953 

See the commits for more details, the messages mostly speak for themselves.

Before:

![Screen_Shot_2015-12-02_at_17.43.23](/uploads/302e734f6796a85a9f4be9c2f494869d/Screen_Shot_2015-12-02_at_17.43.23.png)

After:

![Screen_Shot_2015-12-02_at_17.44.11](/uploads/411980e53a4f87cf0a04e5bcb7329f82/Screen_Shot_2015-12-02_at_17.44.11.png)


See merge request !1964

UI: Issuable filter tweaks

Depends on !1953

See the commits for more details, the messages mostly speak for themselves.

# Highlights

## Filter bar

Before:

![filter_before](/uploads/b061be7521c6d5babb77c7d12e77f65e/filter_before.png)

After:

![filter_after](/uploads/aadfbcd77caf1b49fde8ca6d781f1004/filter_after.png)

## Bulk edit bar

Before:

![bulk_before](/uploads/849c98224e1f335c65c0de5616bbcdae/bulk_before.png)

After:

![bulk_after](/uploads/185d29116663f9f663acab76d328096f/bulk_after.png)


See merge request !1963

Touch project when toggling stars to update cache

This is a fix for gitlab-org/gitlab-ce#3513.

When a star toggle event happens, we touch project to clear cache key.
This will trigger a new "updated_at" at the project model. If it's undesirable, please let me know and I will try to solve it in a different way.

See merge request !1970

Fixes #3468

UI: Issuable list item tweaks

Depends on !1953

See the commits for more details, the messages mostly speak for themselves.

Before:

![Screen_Shot_2015-12-02_at_17.37.40](/uploads/00ac22d131c49ce548bccd96866cbc75/Screen_Shot_2015-12-02_at_17.37.40.png)

After:

![merge_item_after](/uploads/201d742494596c50bbdb3626f06f65a8/merge_item_after.png)

Fixes https://dev.gitlab.org/gitlab/gitlabhq/issues/2590 and https://dev.gitlab.org/gitlab/gitlabhq/issues/2589

See merge request !1962

UI: Use new style for milestone detail page

Depends on !1953

See the commits for more details, the messages mostly speak for themselves.

Before:

![Screen_Shot_2015-12-02_at_17.47.03](/uploads/62441f50963e0c5d6d04b065573c05f0/Screen_Shot_2015-12-02_at_17.47.03.png)

After:

![Screen_Shot_2015-12-02_at_17.47.22](/uploads/ab29ac0c1819415cc647be173f8c92bd/Screen_Shot_2015-12-02_at_17.47.22.png)


See merge request !1966

UI: Project home panel tweaks

Depends on !1953

See the commits for more details, the messages mostly speak for themselves.

Before:

![Screen_Shot_2015-12-02_at_17.46.01](/uploads/f07a4f2370c6863a68df46f655b513c4/Screen_Shot_2015-12-02_at_17.46.01.png)

After:

![Screen_Shot_2015-12-02_at_17.45.40](/uploads/da9b19d3bd89b9421457e0df550efd6e/Screen_Shot_2015-12-02_at_17.45.40.png)


See merge request !1965

The Procfile is for development only



See merge request !1950

UI: Award emoji tweaks

Before:

![emoji_before](/uploads/82786924d3cea0313321b9dde0356cd2/emoji_before.png)

After:

![emoji_after](/uploads/07e94401701d7a622c3ed5cbaa148244/emoji_after.png)

See merge request !1960

Fix failures in master



See merge request !1974

Git rid of deprecated warnings after rails update

https://gitlab.com/gitlab-org/gitlab-ce/issues/3798

https://gitlab.com/gitlab-org/gitlab-ce/issues/3797

See merge request !1946

Fix broken spec related to MySQL and fractional seconds support.



See merge request !1973

UI: Improve consistency across the board

Depends on !1953

See the commits for more details, the messages mostly speak for themselves.

Fixes https://dev.gitlab.org/gitlab/gitlabhq/issues/2577

See merge request !1954

UI: Remove minimum container height

Depends on !1953

See the commits for more details, the messages mostly speak for themselves.

Before:

![Screen_Shot_2015-12-02_at_15.42.07](/uploads/1d8e19e4738bec39074cbb9afc400ad5/Screen_Shot_2015-12-02_at_15.42.07.png)

After:

![Screen_Shot_2015-12-02_at_15.50.34](/uploads/56153fe19bb72163a2dc9dd83850ad89/Screen_Shot_2015-12-02_at_15.50.34.png)


See merge request !1957

UI: More consistent alignment and padding

See the commits for more details, the messages mostly speak for themselves.

# Highlights:

## Merge request form bottom

Before:

![mr_before](/uploads/de2ae608d300784b61818bc33538ac64/mr_before.png)

After: 

![mr_after](/uploads/9b1568d8287704ee9497cc029e827778/mr_after.png)

## Issue header

Before:

![issue_before](/uploads/e8cc4fb316219f025ff7bd74c7da8677/issue_before.png)

After:

![issue_after](/uploads/5fbad99f038571196c3c3c2bea304381/issue_after.png)

## Empty repository message

Before:

![empty_before](/uploads/f6ab80aea9af9111c3dc260d5fa98cd6/empty_before.png)

After:

![empty_after](/uploads/40a528f5a45f4e47776356c88aab24c4/empty_after.png)

Fixes #3742 and https://dev.gitlab.org/gitlab/gitlabhq/issues/2594

See merge request !1953

Also update gitlab-workhorse in patch updates [ci skip]

Fixes #3747 

See merge request !1959

Prevent impersonation if blocked

fixed the documentation of the Guest role in permission.md

This MR fixes the documentation of the Guest role.  

closes gitlab-org/gitlab-ce#3777 

cc @dblessing @JobV 

See merge request !1952