Potential fix for SslHandler dead lock

- Related with: #1181
[maven-release-plugin] prepare release netty-3.6.4.Final
[maven-release-plugin] prepare for next development iteration
Fix a bug in AbstractTrafficShapingHandler.getTimeToWait() where it doesn't work OK when system time goes back.
[#1246] Fix cpu-spinning regression in HashedWheelTimer

Also remove the usage of System.currentTimeMillis() completely here to make it more consistent and correct
[#1246] Correctly convert to nanos
[maven-release-plugin] prepare release netty-3.6.5.Final
[maven-release-plugin] prepare for next development iteration
Better exception message when tickDuration is too big

- Related: #1246
- Fix misc inspector warnings
Fix typo in documentation
sendUnsupportedWebSocketVersionResponse should return ChannelFuture
Fix a bug where LineBasedFrameDecoder does not handle too long lines correctly

 - Related: #1287
Fix incorrect name validation in AbstractHttpData

- Fixes #1228
Add more safe-to-ignore exception messages for SslHandler

... which covers the 'Software caused connection abort: recv failed' from Windows and UDT channels
Add TCP_NODELAY flag to HttpSnoopServer example
[#1322] Correctly handle the removal of Transfer-Encoding: chunked in HttpChunkAggregator
SPDY: refactor SpdyHttpDecoder to allow subclasses to access messageMap
SPDY: SpdyHttpDecoder cleanup and set content length on last message
Fix for #1313 & #1332

For issue #1313, partial fix: enhance coding/deconding to missing part.
Now filename is correctly undecoded. Name and Value must be encoded to
allow parsing.
For issue #1332, add text/plain to content-type as default type if not
specified.
[#1310] Fix deadlock which can happen if limit of MemoryAwareThreadPoolExecutor was exceed and a close is triggered by a write

* Close must be handled from outside the write lock to fix a possible deadlock
  which can happen when MemoryAwareThreadPoolExecutor is used and the limit is exceed
  and a close is triggered while the lock is hold. This is because the close(..)
  may try to submit a task to handle it via the ExecutorHandler which then deadlocks.