Adding support for TravisCE.

The script is based on those of Numpy and Pycwt, as they work well.
Fixing a DeprecationWarning when using NpyIter_AdvancedNew.  Fixes #127.
Merge pull request #126 from Dapid/travisCE

Adding support for TravisCE.
Using standard unittest instead of nose for testing with TravisCI
Some fixes in the README layout
Moving in into an empty disrectory for running numexpr tests in Travis
Using nosetests so as to use the exit value for failure verification.