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.