[gnome-software] (8 commits) ...Merge branch 'refactor-packagekit-plugins' into 'master'

[Milan Crha <mcrha src gnome org>]

Summary of changes:

  7e160a4... packagekit: Merge packagekit-refine plugin into packagekit
  d33c2f1... packagekit: Merge packagekit-history plugin into packagekit
  2818a03... packagekit: Merge packagekit-local plugin into packagekit
  fd7f2d1... packagekit: Merge packagekit-offline plugin into packagekit
  860be50... packagekit: Merge packagekit-url-to-app plugin into package
  d1902d2... packagekit: Merge packagekit-proxy plugin into packagekit
  7474608... packagekit: Merge packagekit-upgrade plugin into packagekit
  f8665bd... Merge branch 'refactor-packagekit-plugins' into 'master'