Finished implementation of the GroundOverlay class. All that is still needed is the <gx:latLonQuad> tag.

* Implemented the altitude property and etree_element() functionality.

Add support for <address> and <phoneNumber> tags.

Handle case where Feature booleans are 'true' or 'false' during parsing, No need to preserve the original values if they are in violation of the specification, we may need to adjust isOpen and visibility so it defaults to the specifications default values

parsing from string

Fixed issue (line length) with kml.py that kept pep8 test from passing.

Fixed bug in which documents inside directories were ignored.

Conflicts:
	fastkml/kml.py

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-)