Adds JSGI tests for ringo/httpserver
Adds multi-header compliance to JSGI spec

This follows RFC 2616 - 4.2 Message Headers
Reverts header serialization.
Updates test for multiple headers.
Remove unused import.
Merge pull request #236 from pykl/promiselist

PromiseList can now take a string of promises, or an array of promises.
Merge pull request #226 from botic/httpserver-tests

Adds basic tests for ringo/httpserver
Merge remote-tracking branch 'upstream/master' into develop
Added support for WorkerPromise to accept the syncCallbacks parameter to control which thread the worker operates on.
Merge branch 'workerpromise' into develop
[maven-release-plugin] prepare release ringojs-0.9.0.6
[maven-release-plugin] prepare for next development iteration
Merge branch 'release/0.9.0.6' into develop