Moved Travis CI to trusty without pip

Try to reenable Travis CI now that they have trusty beta machines.
Install deps and build-deps from branch.
Note that Travis CI doesn't support for 3.4 system package with virtualenv
anymore, so give up on using pip (we can't use just pip packages because of
pygobject) and use system python instead.

.travis.yml

@@ -1,10 +1,16 @@
 language: python
+sudo: required
+dist: trusty
 python:
   - "3.4"
 before_install:
-  - sudo add-apt-repository -y ppa:ubuntu-desktop/umake
+  - sudo add-apt-repository -y ppa:ubuntu-desktop/ubuntu-make
   - sudo apt-get update
-  - sudo apt-get install -qq python3.4 apt apt-utils libapt-pkg-dev gir1.2-glib-2.0 python3-gi sshpass python3-argcomplete python3-progressbar
-install:
-  - "pip install -r requirements.txt"
-script: ./runtests
+  - sudo apt-get install -y $(tests/daily_runs/get_binary_depends ubuntu-make) $(tests/daily_runs/get_build_depends)
+install: "" # we don't want to use virtualenv (see below)
+# as we can't use a system virtualenv anymore in travis CI and that
+# python-gobject isn't installable in pypy, we have to use system libraries
+# instead for both uncompiled and compiled modules.
+# The easiest way without hacking PYTHONPATH, PYTHONHOME is to use the system
+# python version by prepending it in the PATH.
+script: PATH="/usr/bin:$PATH" ./runtests pep8 small

tests/daily_runs/get_build_depends

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+# use this wrapper as travis doesn't like the sed with '/' inline.
+echo $(grep Depends debian/tests/control | tr -d , | tr -d @ | sed 's/Depends:  //')