Mobile fixes

See merge request !1403

Add support for colored header on Android Lollipop with Chrome

Replace match via get with get on routes

Remove or prepend underscore _ to unused method arguments

Change always passing visible false tests.

Make blob new and edit file editors more uniform

Replace regex methods by string ones since faster and more readable

Simplify SSH fingerprint regexp extraction

Replace highlight.js with rouge-fork rugments

Send checkout sha to services

In case of tags it may be useful to have sha of commit this tag points to.
So now web hooks and services get additional parameter `checkout_sha`

See merge request !1400

Remove password strength indicator

We were having the following issues:
- the indicator would sometimes stay red even if the password that was
  entered was long enough;
- the indicator had a middle yellow signal: what does that mean?
- the red/green backgrounds were not color-blind-friendly.

See merge request !1399

Fix tab index

Fixes #1892

See merge request !1401

Update the Omnibus package in Dockerfile

We were having the following issues:
- the indicator would sometimes stay red even if the password that was
  entered was long enough;
- the indicator had a middle yellow signal: what does that mean?
- the red/green backgrounds were not color-blind-friendly.

I decided to create a fork of rouge as rouge lacks a HTML formatter with
the required options such as wrapping a line with <span> tags.
Furthermore I was not really convinced about the clarity of rouge's
source code.

Rugments 1.0.0beta3 for now only includes some basic linting and a new
HTML formatter. Everything else should behave the same.

I did this commit in an earlier revision of my pull request. As
reverting this commit later caused failing tests I decided to
include it again.

Fix comments

Fixes:

* drag-n-drop works for diff comments
* selecting images works for diff comments
* preview works for edit comments
* drag-n-drop works for edit comments
* selecting images works for edit comments
* if comment presented on 'Discussion' and 'Changes' tabs - after edit it updates on both tabs.
* Correctly hide form when edit comment on diff
* fix full-screen for diff comments

See merge request !1398