Some code formatting and cleanup
Extracted WKT writer to separate method

Also some better use of properties, and cleaning up again.
ShapeKitPolygon now also loads interiors when using initWithGeosGeometry and initWithWKT
Extracted duplicate code in ShapeKitPoint
Fixed small bug overusing properties.
Changed loadInteriors to loadInteriorRings for consistency
Conformed method name formatting to Coding Guidelines

See
https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CodingGuidelines/CodingGuidelines.html

And

https://github.com/github/objective-c-conventions
Added newline at end of file.
Missing bracket.
Made wktGeom lazy loaded.
Merge pull request #4 from scspijker/master

ShapeKitPolygon now also loads interiors when using initWithGeosGeometry and initWithWKT