New service adapter with context.
Context replaces our managed Request, ResponseWriter objects, and unifies buffering.
Refactored content negotiation; added media extensions and language support.
Renamed some files to reflect the interfaces contained within.
ETag filter now supports conditionals If-Modified-Since/If-Unmodified-Since.
Refactored ResponseBuffer to be a general-use object.
Fixed filter overrite, the method/override were inverse.
Filter gzip is more intelligent about when and what to compress.
Many fixes of HTTP/REST semantics throughout service and resource.
Initial changes to support absolute URI paths (for virtual resources).
Numerous doc/comment fixes, including code examples, and golint suggestions.
Bumped version up to 0.4.0