rename tStomp.test to tStomp.test.tcl
start working on v0.6

- fix: don't log password
- fix: header parsing if value contains \c
- fix: typos
- enhancement: support for additional headers on connect
add support for additional headers

- enhancement: additional headers for subscribe and unsubscribe
- enhancement: test for durable subscriptions
Merge pull request #11 from siemens/v0.6

Merge v0.6 branch into master.