Let's get "go get"-able

* Get rid of CMakeLists.txt.
* Fix import paths.
* Remove gopy, rubex, termbox submodules, use the limetext forks
  instead.

limetext/gopy was fixed to run with sigaltstack enabled python, see
https://github.com/limetext/gopy/commit/8b1545fdde22aad006ba8596dd7e9ad80ff0dec7.
travis: Adapt for "go get"

* Use go 1.2.
* Python 3.3 via ppa.
* QML frontend disabled atm, because dependency install fails,
  see https://travis-ci.org/limetext/lime/builds/18925007.