Remove RTL leftovers.
Merge pull request #13579 from twbs/nuike-more-rtl-stuff

Remove RTL leftovers.
remove update-shrinkwrap from the default Grunt task

Most folks shouldn't care about the shrinkwrap.
It should only be run on-demand, not as a routine/periodic thing.
Tweak JS style and the relevant JSHint and JSCS checks.
Comply to the new style.
Remove `laxbreak`.
Remove `boss`.
Enable `es3`.
Switch to using plain `if/else` statements when there's no assignment.

The minizer outputs the same code anyway, and this has better readability.
Minor style tweaks.
Fix failing tests.
Run `grunt`.