Adds lint alias task back to the Gruntfile.

Lint is an alias task to lint our Javascript and our whitespace. This
alias task was accidentally removed in #971. Adding it back in resolves
#1157.
Adds newline to end of appRouter

Fixes failing Travis build
Merge pull request #1163 from jmeas/fix-gruntfile-lint

Adds lint alias task back to the Gruntfile.
bump and build for v1.8.1

This release is to update the bower components to
their latest version.
Wrap Marionette in UMD, remove separate AMD version