Pep8

following style checkers:
* pep8 (version 1.5.7)
* pyflakes (version 0.7.3)

Fix typo, add pip requirements file, test for kml.KML.from_string when not a kml string
Thanks 8-)

This form is compatible with Python 2.6.

Fixes the failures found with Travis builds [53, 54]

add Ian Lee to contributors, move contributors list into its own file to keep the text for PKG-INFO ascii only fixes #9 bump version to 0.7

Minor test case additions & lxml warning 
Thanks 8-)

pretty print)

Bugfix for wrong style. oops, thanks :)

Bugfix to handle big files 
8-) thanks a lot

Add kml xmlns if no namespace/prefix is used for kml