Implemented strong_parameters for Category/CategoriesController.

Category now requires parameters to be permitted by strong_parameters using #require or #permit for mass-assignment. Missing required parameters now throw a ActionController::ParameterMissing execption instead of the Discourse::InvalidParameters execption.
Implemented strong_parameters for Invite/InvitesController.

The email parameter is now required using strong parameters and will throw ActionController::ParameterMissing if it is missing. If the email address is incorrect or invalid, Discourse::InvalidParameters will still be thrown.
Implemented strong_parameters for PostAction/PostActionsController.

PostActionsController now uses strong_parameters' #require to require certain parameters. ActionController::ParameterMissing is now thrown when a reqired parameter is missing, rather than Discourse::InvalidParameters.
Implemented strong_parameters for Upload/UploadsController.

The topic_id param is now required using strong_parameters' #require method. If the parameter is missing ActionController::ParameterMissing will be raised instead of Discourse::InvalidParameters.
Updated Dutch translation
Refresh admin user list after approval
Upgrade Ember to RC5. Disabled a deprecation warning that I believe is in error.
FIX: Couldn't navigate to Categories list via link
FIX: Compile templates properly with the latest handlebars
FIX: Have onebox ignore internal links
Remove superfluous }
Merge pull request #965 from stephankaag/master

Correct invalid template
Merge pull request #962 from sanderdatema/dutch_translation

Updated Dutch translation
Merge pull request #960 from iancmyers/strong-parameters

Began implementing strong_parameters
Merge pull request #963 from chrishunt/chrishunt/refresh-user-list-after-approval

Refresh admin user list after approval
Merge pull request #958 from ZogStriP/fix-have-onebox-ignore-internal-links

FIX: Have onebox ignore internal links
FIX: Strip links from google indexed bios when the users are new.
OOPS: Left a testing setting of precompile in development on. Turned it back off.