Merge pull request #13 from anthonygarvan/master

Support for JSON
renamed parser modules to ext_parser to make things cleaner
now that we renamed parser modules, got rid of non_local_import function in utils
added documentation for json parser
enforced consistent ordering when iterating over keys of a dictionary in json parser
committing python_package.rst to repo to fix problems on readthedocs (which doesnt run make html to build the documentation). fixes #11.
added documentation build to the travis tests just to increase the chances that we actually keep the python_package.rst file up to date
Merge remote-tracking branch 'upstream/master'
added support for msg file format