Added a configuration file for Travis.
Changed travis to pull dev version of sympy.
Added Cython to travis build.
Added python 3 installs of numpy and scipy.
yaml error
Only travis testing python 2.7 and 3.3, uninstall pip numpy, set all deps in setup.py.
Install Cython with pip.
Fixed pip syntax error.
Installing nose with pip instead.
Using travis's numpy and nose.
Removed travis testing with Python 3.3.

See https://travis-ci.org/PythonDynamics/pydy-code-gen/jobs/14431040 for the
last attempt.
Yaml syntax error.
Ensured NumPy 1.6.1 is used.
More specific in the Readme about dependencies.