Refactor API code to use annotator-store flaskless
Replace all uses of ann.id with ann['id']

Because of its potential deprecation in annotator-store. There was only
one occurrence, apparently.
Avoid IStoreClass in streamer.py, make _search_raw
Use annotator-store's new search_raw
Adapt to new default analyzer in annotator-store
Remove useless lines/comments
Don't call get_consumer from get_user
Remove IAnnotationClass
Accept index creation error when alias exists
Depend on annotator-store v0.12.0
Remove useless constructor
Prune comments
Remove api.endpoint and api.url from configuration
Consistent naming
First API unit tests
Fix name mismatch status -> status_code
Create DictMock and more unit tests
Style/pep8 and unused imports
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