reintegrating translation branch

Merge branch 'translation_to_pt-br'
Documentation
Added External account type to enum
Documentation
Stop Checkstyle from complaining
Persist fork origin on first run after upgrade
Fixed possible NPE in forks page if user account no longer exists
Show diff by default on compare page
Documentation
Setting a null permission now removes the permission from the user or  team (issue-259)
Adjust unit test to confirm null permission fix (issue-259)
Fixed an incorrect candidate submodule name (issue-266)
Documentation
Added release script template and build.xml adjustments
Prepare 1.3.0 release
Reset build identifiers for next development cycle
Ignore .ps1 and .sh files in root directory
Fixed GoogleCode upload target until they turn off downloads :(
Fixed url panel failure when there are no repository urls (issue 269)
Fixed missing model classes in Gitblit Manager build