Added Gitter badge
Merge pull request #10 from gitter-badger/gitter-badge

Add a Gitter badge to the README
set up gitter and travis integration
yl/Polo - add more CLI options
yl - add cucumber and aruba for CLI test
yl - add help feature test
yl - add Helper module which contains help msg, move Downloader to Util module
Merge pull request #7 from ipmsteven/NewCLI

yl - add more CLI options
yl - spike feature
yl - WIP