Merge pull request #55 from ericcj/master

retry on parse timeouts, add $nin, make object vs. pointer a little easier
added batch operation convenience methods
renamed query setters
Merge branch 'master' of github.com:adelevie/parse-ruby-client
Version bump to 0.1.9
Regenerate gemspec for version 0.1.9
turn up max_retries default to 3 and make it configurable
don't send sessionToken in body of user when saving since it's invalid