Update libv8

This version compiles with clang, so is better compatible with OS X Yosemite
Fix some specs that rely on a cookie token
Fix CarrierWave integration in specs since updates
Fix spec to match fixture data
This test seems broken
Remove unused variable
Allow specifying the “To” user in the Test Run

Closes #12
Update to latest Rails 3.2
Add linear CPS rate increase
Remove trailing whitespace
Add missed DB migration