Pygeoif

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- specify minor python versions tested with Travis CI
- fix for signed area

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- add GeometryCollection
- len(Multi*) and len(GeometryCollection) returns the number of contained Geometries
- add ``orient`` function to get clockwise or counterclockwise oriented polygons
- add ``signed_area`` function
- add ``_set_orientation`` method to lineStrings, Polygons and MultiPolygons

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- ``as_shape`` also accepts an object that is neither a dictionary nor has a ``__geo_interface__``
but can be converted into a ``__geo_interface__`` compliant dictionary

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- change license to LGPL
- add wkt as a property
- ``as_shape`` also accepts a ``__geo_interface__`` compliant dictionary
- test with python3

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- initial release