Add TODO regarding Headers.

git-svn-id: https://svn.forgerock.org/openig/branches/http-framework@534 dbb9e58e-28e6-4ce0-90e8-f11d9605b710
Add prototype client, filter, and handler interfaces and supporting classes:

* Client / ClientOptions: HTTP client which delegates to an SPI implementation
* AsyncFilter / AsyncHandler: proposed new asynchronous server APIs
* Filter2 / Handler2: proposed new server APIs for implementing simple synchronous filters and handlers
* Filters / Handlers: utility classes
* Context: initial prototype replacement of Exchange containing extrinsic server-side request processing state (e.g. client address, ssl parameters, etc)
* ResponseHandler: asynchronous HTTP response call-back interface
* ResponseException: represents HTTP error responses (may be replaced with CREST's ResourceException)
* MessageType: moved to openig-core since it is only needed for filtering.




git-svn-id: https://svn.forgerock.org/openig/branches/http-framework@535 dbb9e58e-28e6-4ce0-90e8-f11d9605b710