Better success messages for `devcenter push`
1.1.0
Silence ThreadError when stopping FileListener, seen in Ruby 2.0
Run web server in a separate thread
Upgrade to Listen 1.3.1 (higher versions hijack signal handling)
Don't force polling in file listener

Shouldn't bring back #10 as `Listen` now requires `rb-fsevent` on install time
Cleanup Previewer
1.1.1