Add documentation files.
Remove sphinxext folder.
Remove sphinx output.
Add docs/_build to .gitignore
Remove api folder. It is automatically created with `make html`
Add api directive to all make commands
ENH: Overhaul TravisCI to use Python build and test on Python 3.3
FIX: Install python3-setuptools and revert to Python 3.2 for Matplotlib fix
Merge pull request #16 from JDWarner/fix_travis

ENH: Overhaul TravisCI to use Python build environment & fix Python 3.x errors
Merge pull request #15 from alexsavio/master

DOC: Add framework to build documentation using Sphinx