implement tags overview
refactor calculating hours spent and percentages
remove legends and do some styling
Rename entry_stats methods
Merge pull request #173 from DefactoSoftware/tags-overview

[READY] Implement tags overview
upgrade to ruby 2.1.3
Merge pull request #185 from DefactoSoftware/ruby-2.1.3

upgrade to ruby 2.1.3
let users enter a description with hashtags when entering time
autocomplete hashtags
mention tags in the description placeholder
use atwho styling with minimal customization
implement tags overview
refactor calculating hours spent and percentages
let users enter a description with hashtags when entering time
Fix entries tables for mobile
downcase tag id for finding  by slug