Let WebSocketFrame extend DefaultByteBufHolder. Part of #910
Let DefaultSpdyDataFrame extend DefaultByteBufHolder. Part of #910
Let multipart use DefaultByteBufHolder. Part of #910
Make use of allocator in WebSockets. Part of #910
Use Allocator in SPDY. Part of #910
Resolve merge conflict
Remove getBinaryData() method as it is redundant with data() and also remove get* from the methods