Update Hprose for Java

Move ByteBufferStream from hprose.common to hprose.io
Move ByteBufferInputStream from hprose.common to hprose.io
Move ByteBufferOutputStream from hprose.common to hprose.io
Change readRaw return type to ByteBufferStream.
Update Hprose for Java

Add Hprose for Spring Remoting.
Set the KeepAlive default value to true in HproseHttpClient.
Update Hprose for Java

Rename hprose_spring_remoting to spring-hprose