PushParser refactoring
- simplified implementation, removed couple unused methods
- type safe TapCallback - no need for reflection, no problems with proguard
fix downloads over 2gb
AsyncHttpServerResponse: long content length fix
Restored old TapCallback api, still supporting simplified operations.
Added missing (removed earlier) methods in PushParser, implemented old TapCallback handling on top of simplified PushParser.
Removed unnecessary object allocations for TapCallback api
XHR-polling support to socket.io

This patch fixes issue #35
Merge pull request #129 from omailson/xhrpolling

XHR-polling support to socket.io
fix minor breakage in test
socket.io xhr: do not reuse builder.
style fixes (this.)
AsyncHttpClient: remove billions of overloads.

The reasoning behind this is to keep the library bare/lightweight. Higher level library like ion
can provide the ease of use.
remove more crufty methods
fixup tests.
Merge pull request #128 from zbsz/parser_refactoring

PushParser refactoring
UnknownRequestBody: allow access to emitter
PushParser: rename methods from Buffer to ByteArray
PushParser: rename methods from Buffer to ByteArray
PushParser: data consumption fix.
BodyDecoder: honor connection-close as an end emitter
Move Dns Parsing
Fix cache corruption.