Remove the drag and drop code in favour of browser builtin support.
Upload a single file selection with ajax too.
Added copyright notice.
Added missing script.
Created sandbox for ajax file upload.
Use eager loaded #principal association instead of #user (#11904).
Avoid to run one SQL query per member on Project#assignable_users (#11904).
ParseDate missing in Ruby 1.9x (#11290).
Potential can't dup NilClass error in UserPreference (#11905).