JERSEY-1617: Content length determining
  - Added buffering functionality to CommitingOutputStream
  - MBWorkers.MessageBodySizeCallback merged to (Buffering)StreamProvider
  - Added configuration enableBuffering() into ContainerResponseWriter
  - Refactored writing and buffering entity on ther client side
    - RequestEnityWriter unified
    - connectors refactored (InMemory connector simulates now Container side)
    - non needed callback interfacess removed
  - Settable added for the future use
  - PS4:
    - minor stylistic changes and javadoc updates.
    - uncommented tests that should have been fixed as part of the task (still failing)
  - PS5:
    - added support for HEAD methods
    - enabled buffering for grizzly container
    - committing of response replaced by closing (fixes gzip streams)
    - PropertiesHelper: RuntimeType support added to all methods (tests added)
    - Removed BufferedOutputStream, buffering refactored (simplified)
    - Removed RequestEntityWriter (part of ClientRequest now)
  - PS6:
  	- review comments incorporated
  - PS7:
  	- copyright fixed

Change-Id: I0a232619e1c3abf8993d51ac88757fb567fcaa1b
Merge "JERSEY-1617: Content length determining   - Added buffering functionality to CommitingOutputStream   - MBWorkers.MessageBodySizeCallback merged to (Buffering)StreamProvider   - Added configuration enableBuffering() into ContainerResponseWriter   - Refactored writing and buffering entity on ther client side     - RequestEnityWriter unified     - connectors refactored (InMemory connector simulates now Container side)     - non needed callback interfacess removed   - Settable added for the future use   - PS4:     - minor stylistic changes and javadoc updates.     - uncommented tests that should have been fixed as part of the task (still failing)   - PS5:     - added support for HEAD methods     - enabled buffering for grizzly container     - committing of response replaced by closing (fixes gzip streams)     - PropertiesHelper: RuntimeType support added to all methods (tests added)     - Removed BufferedOutputStream, buffering refactored (simplified)     - Removed RequestEntityWriter (part of ClientRequest now)   - PS6:   	- review comments incorporated   - PS7:   	- copyright fixed"