PartsBin: Renamed ScriptingTests.js to PartsBinTests.js, because the majority of tests in that file are about the parts bin
PartsBin: fixed overwriting message issue /w test
PartsBinTests: changed the URL's to point to the current PartsBin place
PartsBinTests: when supplying the parts meta info, it should be applied to the deserialized morph
PartsBin: uploadPart has now an additional parameter if you want to upload the part synchronoysly