POC: Updated contrib calendar
In an effort to cut down the JS file size - i've removed the heatmap calendar used for the contributing calendar on users profiles. We already have d3 on the page so why not use it instead of using a library which uses it?

cc. @jschatz1
See merge request !3944
Improve design of Pipeline view
## What does this MR do?
Improves current design of Pipelines view when there is multiple stages.
This makes the statuses clickable and makes the view more compact.
## Screenshots (if relevant)

cc @DouweM @markpundsack @rspeicher @marin
See merge request !4230
Issuable filtering improvements
This improves the filtering of issues and merge requests by creating a single file that encapsulates all the filtering. Previously this was done with a file for issues and a file for merge requests.
Created the ability for the text search to be done alongside other filterables. Previously because this was outside the filterable form, this wasn't possible and would instead do either filter dropdown or text filter - not both. Fixes#4252
Fixed issue with not being able to filter and sort issues without refreshing the page. Fixes#15269
See merge request !3699
Issuable form due date
For some reason, this was never in the original merge request for due date?

Closes#15516
See merge request !3895
This improves the filtering of issues and merge requests by creating a single file that encapsulates all the filtering. Previously this was done with a file for issues and a file for merge requests.
Created the ability for the text search to be done alongside other filterables. Previously because this was outside the filterable form, this wasn't possible and would instead do either filter dropdown or text filter - not both.
Reduce width of side nav
Closes#17338
Part of #14838
Left: old; Right: new
<img src="/uploads/7dba5f22d6bdf1249bab5166addb25b5/Screen_Shot_2016-05-10_at_4.34.07_PM.png" width="500px">
See merge request !4109