Bug 425559 - Lack of serviceRegistry in explorer makes Selection impossible to be created
Bug 425437 - content assist tests failing on master
- Adapted contentAssistTests to expect new Javascript proposal format which extracts the name from the proposal description.
- Passed in option to not include non-inferred proposals since the tests don't expect them.

--Signed-off-by: Elijah El-Haddad <elijahe@ca.ibm.com>
Fix several unit test 404s
Clean up Content Types tests
[Bug 425457] Need a way to construct the content type registry without knowing service registry
[Bug 425457] Add Content Types tests for "no service registry" case