[vala] (6 commits) Non-fast-forward update to branch wip/foreach

[Rico Tzschichholz <ricotz src gnome org>]

The branch 'wip/foreach' 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:

  3e0ac92... vala: Accecpt "unowned var" as type for foreach variable de
  fee58e0... codegen: Report internal error for unsupported collection t
  930a983... glib-2.0: Improve GenericArray.length property
  d43fb4f... glib-2.0: Make PtrArray a subclass of GenericArray
  616a5b1... vala: Additionally look for "length" property for "foreach 
  49fffd7... tests: Add "GenericArray foreach" tests to increase coverag

Commits added to the branch:

  d43edc5... vala: Accept "unowned var" as type for foreach variable dec (*)
  b57f7f2... codegen: Report internal error for unsupported collection t (*)
  a5dbfc4... glib-2.0: Improve GenericArray.length property (*)
  c29ae9b... glib-2.0: Make PtrArray a subclass of GenericArray
  2beca67... vala: Additionally look for "length" property for "foreach 
  a1a54d7... tests: Add "GenericArray foreach" tests to increase coverag

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