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
Added LinearRing import statements

Added LinearRing and asLinearRing to import statements in order to make
loads(wkt) work for LinearRings.
Note that GEOS development headers are also required for speedups.
Merge pull request #58 from maarten-vermeyen/loads_linear_ring

Added LinearRing import statements
Merge pull request #61 from JasonSanford/speedups-docs

Note that GEOS development headers are also required for speedups.
Implement set operators for base geometry
Tests for operators
Fix operator test
Merge pull request #62 from kjordahl/master

Implement operators analagous to uses by builtin set type
Add polygonize_full function to shapely.ops.

Thanks to Sandro Santilli for reminding me how pointers to pointers
work.
Merge branch 'master' of github.com:Toblerity/Shapely
Cosmetic changes to ctypes_declarations.py

- import only a few items from `ctypes`
- rearrange the consistent ordering of `restype` followed by `argtypes`

Also, stop email notifications from TravisCI
Use GEOS version instead of CAPI version (#65)

See https://github.com/Toblerity/Shapely/issues/65

Parts of object names in geos.py and impl.py have been renamed:
 - `14` -> `300` for `3.0.0-CAPI-1.4.1`
 - `15` -> `310` for `3.1.0-CAPI-1.5.0`
 - `16` -> `311` for `3.1.1-CAPI-1.6.0`
 - `16LR` -> `320` for `3.2.0-CAPI-1.6.0`
 - `17` -> `330` for `3.3.0-CAPI-1.7.0`

`shapely.geos` has three version-related members:
 - `geos_version_string`, restored to prior versions of Shapely (still
   present in manual); this version string found in in geos_c.h and
   in other programs like PostGIS
 - `geos_version`, (major, minor, release) version tuple for GEOS library
 - `geos_capi_version`, former version tuple to determine GEOS library
   capabilities; example use of this member was removed from manual, as
   its use should be discouraged.

`geos_c_version` was an alias for `geos_capi_version`, but was removed.
Updates to manual and change log for 1.2.18.
Reorganize existing GEOS functions in ctypes_declarations.py

 - Add section headers from geos_c.h, and move functions to nearest
   position, and nest capabilities from each GEOS version in `if` blocks
 - No functions add (yet), only re-arranged order and verified GEOS version
 - Remove reference in LGEOS300 to GEOSUnionCascaded, which was
   introduced in GEOS 3.1.0