DOCS: Added a pip-requirements so that readthedocs can build the documentation.
Merge pull request #25 from jstac/rtd

DOCS: Added a pip-requirements so that readthedocs can build the documentation
minor edits to documentation
moved examples test script to examples/tests
Merge branch 'master' of github.com:jstac/quant-econ
Added examples/tests (forgot to on last commit)
Merge branch 'master' of github.com:jstac/quant-econ into py2to3
Py2to3: Iterators don't allow the .next() method, changed it to reflect the new syntax.