resolves #474 seems viewItem had problem
Merge branch 'master' of github.com:limetext/lime

* 'master' of github.com:limetext/lime:
  [ci] Use the private-dev packages again.
  [ci] Try a PPA for qt5.
  [ci] Try different versions of the qt5 packages.
  [ci] Add some qt5 dependencies.
  [ci] Add the deadsnakes PPA.
  [ci] Pull the install steps out into a script.
  [ci] Add a script to build the frontends.