Fixed issue with no label not working correctly

Created issuable singleton to house the filtering

get the multi filter labels feature to work on merge request, also escape characters in the templates to prevent xss attack

This ensures that IssuableFinder returns a collection of unique issues,
even when filtering issues using multiple labels.

Redis configuration consistency

Related https://gitlab.com/gitlab-org/gitlab-ce/commit/cf669551f69edd66913d22c96cf1de1302e7990e

See merge request !3697

Hide top search form on the search page

Closes #14771

![Screen_Shot_2016-04-11_at_6.04.19_PM](/uploads/44cf2110bad29c0df06d874740a3a61f/Screen_Shot_2016-04-11_at_6.04.19_PM.png)

See merge request !3668

Set tooltips for new added labels

Fixes #15093 

![Screen_Shot_2016-04-11_at_5.50.21_PM](/uploads/52d06f6ccb3ca42e7ce75b94111514c2/Screen_Shot_2016-04-11_at_5.50.21_PM.png)

See merge request !3667

Update delete button

Closes #14762 

![Screen_Shot_2016-04-11_at_5.21.32_PM](/uploads/fef09645eb70fc0fcaee359245664ddc/Screen_Shot_2016-04-11_at_5.21.32_PM.png)

See merge request !3665

Fixed alignment on issuable new form

Fixes #13802

![Screen_Shot_2016-04-11_at_17.03.29](/uploads/d359580e693284d4b694d8158d4f736e/Screen_Shot_2016-04-11_at_17.03.29.png)

See merge request !3661

Updated InfluxDB/Grafana setup/import docs

See https://gitlab.com/gitlab-org/grafana-dashboards/merge_requests/1 for some background info.

cc @dblessing 

See merge request !3706

Clean up ExclusiveLease

See merge request !3695

Fix a bug with trailing slash in bamboo_url

Also, improve specs for BambooService

Similar to !3679.

See merge request !3680

Fix trailing slash in teamcity_url

Originally opened at !2309 by @ctmay4.

As described in #3515, if you have trailing spaces in the the Teamcity server name, the service
will not work properly.  Switching from `URI.parse` to `URI.join` fixes it so that it works with
or without a trailing slash.

Fixes #3515.

See merge request !3679

Load related MRs/branches asynchronously

cc @dzaporozhets 

See merge request !3678

Make milestone labels in labels tab similar to that of the labels page

I realized that some of the changes for the labels page was not reflecting in the labels list in milestone page.

## Desktop
![Screen_Shot_2016-04-11_at_4.25.36_PM](/uploads/e21f3c5a9187fe32472e796171781b5d/Screen_Shot_2016-04-11_at_4.25.36_PM.png)

## Mobile
![Screen_Shot_2016-04-11_at_4.26.47_PM](/uploads/5c9f75ca0938fc30ab47c5520215f692/Screen_Shot_2016-04-11_at_4.26.47_PM.png)


See merge request !3658

API: Subscribe and unsubscribe from issues and merge requests

* Closes #6024 

This MR is based on !3611, which must be merged first.


See merge request !3615

The grafana-dashboards repository now contains _all_ GitLab.com
dashboards and thus requires some extra continuous queries to be set up.
The repository now also provided a way to automatically import/export
dashboards.

[ci skip]

Fix high CPU usage when PostReceive receives refs/merge-requests/<id>

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/12661


See merge request !3651

Currently this works by loading the HAML partials via XHR. While this is
not the nicest setup it _is_ the easiest setup using the tools we
currently have.

Loading this data asynchronously doesn't make loading the related
MRs/branches itself faster, it merely ensures that loading the issue
itself is not slowed down.

Fixes gitlab-org/gitlab-ce#14949