(feat) Removed generation script.
(feat) Removed generation targets.
(feat) Added content-type dependency.

Fixes #67
Merge pull request #111 from reem/feat/generation-module

(feat) Moved code generation into its own module
(feat) Added Request wrapper around HttpRequest
(doc) Documented Request wrapper.
(cleanup) Deprecated mixins.

Convenience methods can now be implemented directly on Request and Response,
with no need for additional traits to define mixins.
(feat) Added Response wrapper around HttpResponse.
(feat) Updated handle_request to use new wrappers.
(doc) Documented Response wrapper.
(chore) Added lib log as a dependency.
(doc) Documented Response wrapper fields.
(cleanup) Removed reference to mixins.
(fix) Final small fixes.