THRIFT-2813 multiple haxe library fixes/improvements
Client: Haxe
Patch: Jens Geyer

This closes #260
THRIFT-2814 args/result classes not found when no namespace is set
Client: Haxe
Patch: Jens Geyer

This closes #261
THRIFT-2815 Support for Multiplexing Services on any Transport, Protocol and Server
Client: Haxe
Patch: Jens Geyer

This closes #262