Search tools & My Issues filter

This will restyle the issues list layout, add "Search tools" and new "My issues" filter. Ref #234

![snap](https://f.cloud.github.com/assets/3051676/2403995/d7ae792c-aa35-11e3-84d7-7a9b728089e5.png)

P.S.
New Tracker.pot file was pushed to Transifex.