Port old JS Spec tests to Mocha

Changes that happened to jquery.couch.js which were not
reflected by the current failing JSpec Testsuite and
required changes to the testuite:

 - jquery.couch returns the time for the request and not an
   object with an url property
 - jquery.couch does not show alerts any more
 - success callbacks don't return a status any more
 - db.copyDoc expects an docid as target in the first option object,
   not a third parameter with an `Destination` property

COUCHDB-1566
Fix broken key options

noticed while porting the tests