GitLab

The Python development files appear to be already installed on Travis so
remove the apt-get call that tries to pull them in.

System site packages only works for Python 2.7 and 3.2, so remove for
3.3 and 3.4. Also install liblapack because it seems like cvxopt does
not find atlas.

Install Python 3 verions of the dependencies when the Travis build is
Python 3, and install the development packages for cvxopt to be built.

Add travis command to install numpy, scipy and cvxopt.

Add the Travis CI build configuration so that the repository can be
tested using continuous integration.