internal changes:
- Compiler.CodeGenerator namespace removed
- introducing basis for compilation in separate objects (lightweight AST)

git-tfs-id: [http://falcon:8080/tfs/Projects]$/Phalanger/Main;C4629
Release configuration build fix

git-tfs-id: [http://falcon:8080/tfs/Projects]$/Phalanger/Main;C4632
Merge remote-tracking branch 'refs/remotes/tfs/default'