Adding "PT" locale language files

Added the portuguese translations files for the "pt" locale
Merge pull request #406 from pedropeixoto/dev

Adding "PT" locale language files
Adding “ja” locale language files

Added the japanese translations files for the “ja” locale
adding laravel 4.1 compatibility (See #414, #419)
Merge branch 'dev' of git@github.com:FrozenNode/Laravel-Administrator.git into dev
Merge pull request #421 from konomae/dev

Adding “ja” locale language files
Class name <-> File Name Agreement

Re-submitting on the dev branch.
Merge pull request #427 from jhampton/dev

Class name <-> File Name Agreement
updating language list in docs
version bumping to 4.9.0
Merge branch 'dev' of git@github.com:FrozenNode/Laravel-Administrator.git into dev
Merge pull request #436 from FrozenNode/dev

Merge 4.9.0 into master
Merge remote-tracking branch 'upstream/master'