Resolve #44: Rename TraceeConstants of MDC keys to traceeSessionId and traceeRequestId
Resolve #46: Rename HTTP and JMS header to "TPIC" (TracEE propagated invocation context)
Merge pull request #51 from SvenBunge/TPIC

Resolve #46: Rename HTTP and JMS header to "TPIC"
Merge pull request #50 from SvenBunge/MdcTraceeConstants

Resolve #44: Rename TraceeConstants ...
this is the current result of the Apache CXF integration for TracEE. It's untested!
Some further work on cxf integration
Add some tests for plain Messages
Add some tests for plain SoapMessages
Minor code cleanups