[gtk] (8 commits) Non-fast-forward update to branch matthiasc/for-master

[Matthias Clasen <matthiasc src gnome org>]

The branch 'matthiasc/for-master' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  8d9bcbd... Fix the release script some more
  00b101c... icontheme: Clarify the docs
  d07d3a0... build: Change introspection option to type 'feature'
  7de4392... Mention icon theme in the migration guide

Commits added to the branch:

  97276a5... Remove gtk-doc stanzas from private GtkBuildable API (*)
  c6cedf6... Add annotations for GtkBuildable virtual functions (*)
  7ad42df... menubutton: Remove obsolete private method (*)
  76d6169... Merge branch 'ebassi/for-master' into 'master' (*)
  87393c7... Merge branch 'small-cleanup' into 'master' (*)
  7defc3b... Fix the release script some more
  9d70112... icontheme: Clarify the docs
  5fa765b... Mention icon theme in the migration guide

(*) This commit already existed in another branch; no separate mail sent