Merge pull request #114 from ysksn/master

re-factoring
Add --max-id and --since-id flags to favorites command

Per request of @jm3 in https://twitter.com/therealjm3/status/370621711999172608
cucumber, vcr, and guard-rspec gems added
Gurdfile created by "guard init rspec"
host machine Linux and Windows added
duplicated specs removed