[ease] (23 commits) ...Refactor Document from Theme code to a constructor, copy media from themes.

[Nate Stedman <natesm src gnome org>]

Summary of changes:

  032df63... Created a SlideSet base class for Document and Theme. (*)
  b9aa8fd... Added the beginnings of support for themes. (*)
  1b7d08d... Merge branch 'master' into themes (*)
  af745cc... Favor Element.get over Element.data.get. (*)
  7dae051... Better handling of paths. (*)
  197b782... Merge branch 'master' into themes (*)
  56c3416... Automatically package themes with tar when installing. (*)
  a05a33d... Extract theme archives to /tmp. Introduces dependency on li (*)
  bb1163c... Move archive extraction code into Temp to allow for reuse. (*)
  7d7d030... Fix last commit. (*)
  92de3da... Merge branch 'master' into themes (*)
  6e691b1... Fix appearance of image backgrounds in theme previews. (*)
  a35e5ee... Round the position of actors containing text to avoid blurr (*)
  81ee11e... Use build_filename instead of build_path. (*)
  ede7351... Fixed the first copy of Ease to be closed deleting all temp (*)
  11b3c47... Support archiving and unarchiving Ease documents. (*)
  5bacaf7... Added "tar" as a required program in the README - this won' (*)
  6b1597f... Fix saving new Documents. (*)
  aee0e5c... Merge branch 'master' into themes (*)
  dc022e0... Switch to using a string/strut style method of scaling them (*)
  a314b20... Add GtkFileFilters to dialogs. (*)
  c78ebf6... Added "Pink" theme. (*)
  816dd6c... Refactor Document from Theme code to a constructor, copy me (*)

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