Showing synthetic tree by default, and converting ottol IDs from search.
Adding a simple jQuery splitter for  argus+provenance

From http://github.com/jcubic/jquery.splitter
Simplified UI to work with draggable splitter.
Adding requirements.txt file with known-good python modules
Adding information about 'requirements.txt' to README
Extract Subtree (via download), for ottol ids only.
Merge pull request #16 from OpenTreeOfLife/provenance-display

Improved display, search, subtree download, etc.