Added method removeAllowedUser to topic_details.js

perform a request to /t/:id/remove-allowed-user,
then delete the user from the local list
Improved private message user removal, locale edit

replaced array iteration with findProperty (will be renamed and aliased to findBy with Ember 1.1)
added modal dialog to verify
catched nil-error on topic.rb
adds unit tests for Discourse.debounce
Replace Guard + Rspec section with Tests section that describes the use of rake autospec
Merge pull request #1492 from Yenwod/fix-docs

Replace Guard + Rspec section with Tests section that describes the use of rake autospec
Merge pull request #1489 from velesin/debounce_tests

adds unit tests for Discourse.debounce
Merge pull request #1488 from cfstras/removeAllowedUser

Allow removing users from private conversations
Pop up with user information when clicking avatar on topic page
Adjust smoke test to work with user expansion
Increase size of click target on topic progress
FIX: Missing username in link to user
Version bump to 0.9.6.4
FIX: Private Message link was broken
Don't show private message button when not logged in
Small visual tweaks to user expansion
security issue, anon and logged in users could see the fact that a user sent another user a pm (but could not see the pm itself or title)
Merge remote-tracking branch 'source/master' into development
Merge pull request #27 from cdman/development

Merge latest changes from upstream.
Merge pull request #28 from udacity/development

Merge latest changes from upstream.