initial generic api widget
API SuperTable. Support paging, column filtering, column rendering, and table styling and setting the width. Supports ability for column renderer to add its own set of columns. First set of column renderers are user id, synapse id, datetime, and a special case for entity annotation gathering.  Add an alpha mode in the website to show alpha features (like the SuperTable widget editor).
merge api table (supertable) with upstream develop
include a column renderer init failure test
changes from code review
Merge pull request #192 from jay-hodgson/develop

API SuperTable