Configure Travis CI

- Add missing grunt-cli dependency

- Fix node scripts to use local grunt

- Update current branch detection to work
  in the Travis CI environment
  - had to remove a “if git fails” test, and using this form
    of detection, and newly int’d repo has master as the curr
    branch

- Add Travis build status button
    Note that build will be marked as failing
    until travis is integrated with source repo
    (dymonaz/grunt-checkbranch)