Installed SonataAdminBundle
Added PaulMaxwellBlogAdminBundle with Sonata Admin classes
Added tinymce bundle
Tweak for correct images path in tinymce
Moved additional Sonata Admin configs into PaulMaxwelBlogAdminBundle
Added authentication for admin panel
Added admin translations
Fixed bug with missing tags
Added admin link into main menu
Merge branch 'feature/admin' into dev
Merge branch 'dev'