Wrap underlying output stream with a buffered one whose buffer size is configurable

[spericas]

Wrap underlying output stream with a buffered one whose buffer size is configurable. Using a buffered stream prevents bad interactions between Nagle's algorithm and delayed ACKs in TCP. Drop extra buffering in encoders to avoid double buffering. Minor fix in the ListenerConfiguration class and new test.

Summary of additional changes:

• StatusResource updated to not return an entity on a 204 status
• Gzip and Deflate codecs modified to not use an additional buffer (to avoid double buffering)
• ClientRequestImplTest now calls flush() explicitly
• New call to flush() in ErrorHandlingWihtOutpuStreamTest
• Method maxPayloadsize(long) did not return the Builder as required and was fixed
• New test for write-buffer-size property