Baby steps towards webmachine implementation.
Added unrest_context:all/1
More work on webmachine: new methods, code cleanup
Updated webmachine.yml doc to reflect changes in code
Create LICENSE
Updated wm example resource with new callbacks
Merge branch 'in-progress' of https://github.com/dmitriid/unrest into in-progress
updated cowboy to 0.8.6
implemented the "validation and auth" part of wm flow

See https://twitter.com/seancribbs/status/354790811973586944/photo/1
Implemented accept and accept-language
Implemented accept and accept-language
Invalid accept-language header will no longer crash the flow
Add erlang stacktrace to unrest_flow's error logging
Implemented accept-charset
Implemented variance
Merge remote-tracking branch 'origin/master' into in-progress
variances is now a part of the flow
Completed webmachine's content-negotiation flow

+ Implemented accept_encoding
* Fixed variances
Fix handling of {flow, FlowName, Ctx}. Closes #16
Started work on existence and redirection flows