Fixed upgrade command

`brew update foo` => This command updates brew itself, and does not take formula names.

Hence: `brew upgrade asciiio` => Error: asciiio-HEAD already installed
Merge pull request #107 from miketheman/patch-1

Fixed upgrade command
Use http url for avatar in footer
Update bundle
Update decorators to use new Draper API
Nail down the ruby version
Upgrade Rails to 3.2.13
Nail down gems versions
Generate coverage only when requested
Clean db before whole suite
Disable airbrake in dev env completely
Reformat Gemfile
Reorganize Guardfile
Use poltergeist as js driver for capybara
Inject factory_girl create/build methods into example groups
Don't run slow specs via guard
Fix draper vs kaminari issue
Don't check for webkit anymore when enabling WebWorker player
Add missing feature specs
Make sure docs pages are fine