Allow failures for coverage
Allow failures for coverage

Currently there is a bug in node-coveralls that causes branches to
sometimes fail.

wehriam/pouchdb-find,nolanlawson/pouchdb-find,nolanlawson/pouchdb-find,wehriam/pouchdb-find,wehriam/pouchdb-find,nolanlawson/pouchdb-find,wehriam/pouchdb-find,nolanlawson/pouchdb-find