Hide control elements and last login for xs display

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Hide group dashboard and project sidebar for xs size

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Merge branch 'mobile-ui-improvements' into 'master'

Mobile ui improvements

* Fixes blob view - https://twitter.com/jamesgecko/status/466675058664951808
* Hide project sidebar for xs
* Hide group activity for xs