Removed format validation

**What does this MR do?**

Removals format validation for drone token

**Are there points in the code the reviewer needs to double check?**

Nothing

**Why was this MR needed?**

because drone migrated to JWT tokens and JWT token doesn't valid with current format ( i don't know how many symbols JWT can use for this )

See merge request !1359

Bump devise-two-factor to 2.0.0

Addresses internal https://dev.gitlab.org/gitlab/gitlabhq/issues/2605

See https://github.com/tinfoil/devise-two-factor/pull/43

See merge request !1363

fixes link to reply_by_email docs

Addresses internal https://dev.gitlab.org/gitlab/gitlabhq/issues/2605

See https://github.com/tinfoil/devise-two-factor/pull/43

Fix failing migration on mysql

We didn't specify that the db user needs the right to create temporary
tables before. That's why the migration will fail on most installations
that installed gitlab according to our documentation. This MR removes
the "TEMPORARY" from the migration and changes the documentation to
include the necessary rights for the future.

Fixes #2590

See merge request !1351

Fix IssuableContext javascript

We were calling `affix` before the events were bound so they never
triggered correctly.

Closes #2597

See merge request !1356

We were calling `affix` before the events were bound so they never
triggered correctly.

Closes #2597

Remove API calls CE->CI



See merge request !1307

We didn't specify that the db user needs the right to create
temporary tables before.
That's why the migration will fail on most installations.
This commits removes the "TEMPORARY" from the migration
and changes the documentation to include the necessary rights for the future.

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

Fix typo in Reply by email docs

See merge request !1346

Fix CI status in the MR page

https://gitlab.com/gitlab-org/gitlab-ce/issues/2587

See merge request !1347

Add pg_schema to backup config

https://dev.gitlab.org/gitlab/gitlabhq/issues/2489

See merge request !1345

Allow to disable GitLab CI

Added simple config option to disable GitLab CI

It makes all CI related requests to return 404

/cc @dzaporozhets @jacobvosmaer @vsizov

See merge request !1340

Allow custom info to be added to Help page

Fixes #2536

**Admin screen**

![image](https://gitlab.com/jeroenvanbaarsen/gitlab-ce/uploads/e62f3e0ff40558fb955f09e469293521/image.png)

**Text on the Help page**

![image](https://gitlab.com/jeroenvanbaarsen/gitlab-ce/uploads/ba315fb418e1698d8f44b88c7cc6c29a/image.png)

/cc @DouweM

See merge request !1309

Fix 500 when accessing private project when not logged in



See merge request !1336

Fix 500 on trending projects if isntance has 100k+ projects

Fixes #2576 
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !1341

Remove Cancel button from CI Project settings

Resolves https://gitlab.com/gitlab-org/gitlab-ce/issues/2568

See merge request !1337

Project header titles

Fixes my issues with !1293, see [my comment](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/1293#note_2112289):

> No please, not this huge if/else statement again! This will get out of sync so quickly, like happened with the original page titles before the page_title helper per page :(

cc @haynes 

See merge request !1328

Fix: ci projects order

https://gitlab.com/gitlab-org/gitlab-ce/issues/2553

See merge request !1333

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

Fixes #2536
Signed-off-by: Jeroen van Baarsen <jeroenvanbaarsen@gmail.com>

Note about global keys

Because of tweet https://twitter.com/ChoboIslah/status/639565184806309888

See merge request !1931