Update script generator to work OOTB

[mal]

• Update dependencies
  • Add missing grunt and grunt-cli packages
  • Re-add chai and sinon to be npm 3.x compliant
  • Lock coffee-script to the same as hubot
• Update travis config
  • Use new container architecture
  • Cache node_modules (faster test runs)
  • Switch from node 0.11 to 0.12 for testing
  • Add iojs to test matrix
• Update Gruntfile
  • Add src directory to watch list
  • Load additional grunt tasks in consistent manor
  • Remove superfluous watch log message