Add a test for keymaps

@rcsimm caught a super simple bug in HLCodeWidget#pcKeyMap and I'd like
no one to ever have to deal with it again - this test will ensure that
key maps returned by HLCodeWidget are always collections of
associations.
Update HLCodeWidgetTest#testKeyMap's protocol
Load Helios-Workspace-Tests when loading Helios
Merge pull request #504 from kpullen/test-keymaps

Ensure that keymaps returned by HLCodeWidget are collections of associations