Test improvements
- added missing testException tests
- aligned cross test return codes
- aligned cross test command line arguments
- added --skip-speed-test switch

Code generator improvements
- added suffix "_FIELD_ID" to the fieldIDs to prevent name collisions with uppercase-only members (like ID, VAT)
- always render enum type with full namespace to prevent name collisions with class members

Library improvements
- HTTP transport client added
- Generic Stream transport added, implemented FileStream transport
- fixed possible double UTF-8 encoding/decoding in JSON protocol
- Haxe Thrift library test project added