[#1212] Fire handshake status events to notify the user about handshake states
[#1211] Fail ChannelPromise on SpdyProtocolException like it was before in 3.x
[#1202] Fix javadoc
SPDY: allow multiple notification of closeSessionFuture
upgrade to maven 3.0.5

As Netty is using its own CI now
Fix typo in BufType javadoc
enable checkstyle for test source directory and fix checkstyle errors