remove .rvmrc.

Lu
add method to get impact missions.

Lu
(cherry picked from commit 6459e8c)
fix count of completed missions.

Lu
(cherry picked from commit 920ceaf)
add impact missions section.

Lu
(cherry picked from commit d554d7d)
move text to locals

Lu
(cherry picked from commit 639e47c)
add tabs for league detail page.

Lu
adjust page style.

Lu
rename and reorder league's complete missions.

Lu
Merge branch 'impact_missions' of github.com:Useful-Inc/big-help-mob-webapp