[gnome-shell] (9 commits) Non-fast-forward update to branch wip/fmuellner/es6-classes

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

The branch 'wip/fmuellner/es6-classes' 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:

  b83ab34... cleanup: Port non-GObject classes to JS6 classes
  4501d5b... cleanup: Port GObject classes to JS6 classes
  9ecaea1... docs: Update HACKING
  7704d7a... lookingGlass: Don't import Lang by default

Commits added to the branch:

  deec0bf... texture-cache: Replace ClutterTexture by ClutterImage (*)
  1847a4f... texture-cache: Avoid creating unnecessary ClutterImages (*)
  3dcb593... texture-cache: Simplify function with g_autoptr (*)
  d75a348... windowManager: detect change to a non-existent WS (*)
  99ce3de... st-button: Handle touch-cancel events (*)
  bacfdbb... cleanup: Port non-GObject classes to JS6 classes
  e68dfed... cleanup: Port GObject classes to JS6 classes
  b7e2718... docs: Update HACKING
  d80e7e0... lookingGlass: Don't import Lang by default

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