unit tests for python 3 on travis CI
unit tests for python 3 on travis CI

 * run unit tests for both python 2.7 and python 3.3
 * use pre-built wheels for compiled dependencies (hosted on
   http://clostridium.ucsd.edu/wheelhouse. This is faster and better
   that using apt-get and simlinking scipy in

aebrahim/cobrapy,JuBra/cobrapy,jerkos/cobrapy,zakandrewking/cobrapy,zakandrewking/cobrapy,jeicher/cobrapy,aebrahim/cobrapy,jerkos/cobrapy,jeicher/cobrapy,JuBra/cobrapy