Merge pull request #11 from IanLee1521/master

Fix typo, add pip requirements file, test for kml.KML.from_string when not a kml string
Thanks 8-)
Applied PEP8 and Pyflakes style guidelines to fastkml source code using the
following style checkers:
* pep8 (version 1.5.7)
* pyflakes (version 0.7.3)