Mobile UI improvements

Added some extra information how a good MR looks like

Remove periods from merge request

Start development Key seed id from 1 to prevent `Couldn't find Key with id=0` crash on MySQL.

Move Project's service specs to the correct location

Update guide from 6.0 to 6.7

Move spinner for mobile

The "Merged by" and "Closed by" statements end with an extra space followed by a period. This doesn't seem necessary to me and not having the extra space followed by a period looks better to me. Also, the top of the merge request doesn't have the sentence ending with a period.

[ci skip]

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

What Is A Bug

Fix http clone for public project

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Update Upgrade Document for 6.7

Use the latest version of gitlab-shell which is 1.9.0

Merge branch 'username-keys-content-type' of https://github.com/dmedvinsky/gitlabhq into dmedvinsky-username-keys-content-type
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Conflicts:
	CHANGELOG

Replace gemoji with open source PhantomOpenEmoji

Currently this method responds with `text/html`. It is kind of unusable
if you open it in a browser. The browser thinks it is HTML and renders
it as HTML, meaning new lines are dropped. So it's very hard to
distinguish where the key starts and where it ends.

This commit changes the content type header to `text/plain`.

Cloud Update

/cc @jacobvosmaer @marin @job

Oauth Require Public Email

Does not fix #976 yet, but will reduce the amount of users getting 422 immensly.

Deploy Key Doc

/cc @marin @job @jacobvosmaer

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Changelog O'Reilly

added "Better API for access_levels" sponsorship from O'Reilly to CHANGELOG