Rq-dashboard

- Mark as incompatible with RQ 1.0 (see 172 for details)
- Add first/last page links to pagination (Thanks Yeray Diaz Diaz)
- Fix 404 errors in docker (Thanks skullY)
- Add confirm modal for dangerous action (Thanks Gerard Sole)
- Enable copy-paste in Jobs table (Thanks Gerard Sole)
- Drop support for EOL Python 2.6 (Thanks Hugo)
- Add Cache-Control header to API
- Update jquery version (Thanks caub)

* Display current job in tooltip in workers list. Thanks Daniel Hnyk
* Allow to specify return URL through get parameters for external systems integration. Thanks Radomirs Cirskis
* Add tests to packages ignore list. Thanks kitsuyui

Changes:
- Support Redis Sentinel connection. Thanks Šarūnas Navickas
- Allow to hide worker list. Thanks Thomas Kriechbaumer
- Allow to delete jobs instead of cancelling. Thanks Javier Lopez
- Now RQ dashboard requires RQ 0.10.0. Thanks TÖRÖK Attila

Bug fixes:

- Fixed broken legacy behaviour with string redis_url. Thanks Javier
Lopez

Other noticable changes:

- Readme has brought to a better shape. Thanks teisena
- Brought basic unit tests support and CI