add boostrap classed for flash messages
do not use the free email field of github to authenticate users
use verified emails only
Merge pull request #31 from alexandrz/master

Use verified emails only
send security issue email
increase project amount cache capacity
added a button to immediatly send tips back to their project (closes #47)
quiet assets
added cucumber
projects have a list of collaborators
configured test environment
project collaborators can put tips on hold
project collaborators can decide tip amount of undecided tips
only collaborators can change projects and set tip amounts
added author and message to the tip decision table
fixed feature, there should be one email per commit
collaborators can display tipping policies on the project page
switched to the new rails-bootstrap-forms gem
better display of undecided tips
amount given diminishes after each decision (fixes #68)