Add more options to buffering
Refactor styled buffering to work with geos < 3.2
Add more detailed description about styled buffering
Add short example for style buffering
Change parameter type of buffer for consistency with parellel_offset
Update manual for styled buffering
Add enum style classes for cap and join styles
Add missing cap and join style imports
Use join style class for parallel_offset operation
Merge branch 'buffer-with-style' of git://github.com/ahojnnes/Shapely into ahojnnes-buffer-with-style

Conflicts:
	shapely/geometry/__init__.py

Make enum members lowercase as in PEP 435 examples.
Use new enums from #55.