Added new version of www-apps/mantisbt
* Masked 1.2.12 because of security issues ( http://www.mantisbt.org/blog/?p=244 )
* Added 1.2.14 ( 1.2.13 was skipped due to a failed release )
Masked ancient versions of www-apps/mantisbt
Updated Manifest file
Merge remote-tracking branch 'The-Judge/master'