Merged previous changes
Changed calculated_rank to decimal in db migration
Sets default scores to 50th percentile in case of nil values
posts now show age in minutes
Merge pull request #52 from chorus-frogs-2014/stylesheets

Stylesheets
Merge pull request #51 from chorus-frogs-2014/angular_plus_2

posts now show age in minutes
Final score complete with modified time decay
Merge pull request #53 from chorus-frogs-2014/scoring2

Scoring2
fixed ui recomendations by britney