Add ATK_ROLE_STATIC and clarify ATK_ROLE_TEXT

https://bugzilla.gnome.org/show_bug.cgi?id=739981
Document the deprecation of ATK_STATE_ARMED

https://bugzilla.gnome.org/show_bug.cgi?id=740152
Removed a comments that should (and is) part of the docs
Release 2.15.2
Unref STATE_TYPE class ref after using it at state_type_get_name
AtkTable: Added missing ":" on one gi annotation
Merge branch 'master' of git://git.gnome.org/atk
JOHNE - Bump the version number to 2.15.02