Merge pull request #252 from OpenTreeOfLife/merge-otus-and-refresh

Merge otus and refresh (cont'd)
Fix for URL to looking irmng entries by taxon name.

Closes #239.
Fix for newTreesPreferred request.args => .vars
Corrected checkbox name for preferred trees
Sending curator to View page (vs. immediate Edit)

This is in response to concerns that it's too easy (or unnerving) for a
logged-in user to jump immediately into some other study and possibly
lose/mangle its data.

N.B. This does not change our simple rule that any logged-in user
(anyone with a GitHub account) can edit any study in the system.
Add study-download options & link to Open Tree API
Error exit in merge_otus

I catching exceptions. Return "error":0 of for success (with "data"
) and "error": 1 for failure (with "description" with an error
message).
Look up DOIs (and reftext) on CrossRef.org
Merge branch 'master' of github.com:OpenTreeOfLife/opentree
Update on paste in all cudration fields.
Update filter on paste (main study list)
Merge pull request #256 from OpenTreeOfLife/doi-reftext-lookup

DOI + ref-text lookup
Adding Google Scholar lookup to References page.
Clean up diagnostic junk.
Add lookup links to References (if missing DOI)