Update development (ot11) to use 'devtree' domain

Also made these changes:
 * fixed some critical typos in CURATION_* variable names;
 * updated client IDs and secrets to match registered apps on GitHub
   (currently owned by GH user 'jimallman');
 * switched to ot10 for oti and API services;
 * removed old/unused vars; and
 * reset 'opentree' to use master branch (to get latest improvements).