Defined and use variables for .panel-heading & .panel-footer padding
Use CSS Flip to generate RTL variation
add Grunt task for css-flip-ing & add RTL to Gruntfile configs
update shrinkwrap
Fix for issue #12854 where push and pull resets

The col-*-push-0 and col-*-pull-0 classes try to reset the positioning using 0% but this prevents the opposite direction positioning to freeze and not being set correctly.
To fix that, these must set the position to auto instead of 0% with means left:auto and right:auto instead of left:0% and right:0%.
Break csslint targets.
Fix csslint errors.
Move csslint overrides in Gruntfile.js.

This works around https://github.com/gruntjs/grunt-contrib-csslint/issues/26
Switch to using JSCS for the indentation check.
Move the quotes check to JSCS.
JSCS: Use more style checks.
Move `camelcase` check to JSCS.
Move `trailing` check to JSCS.
Move `immed` to JSCS.
Gruntfile.js: use the same targets as JSHint for JSCS to avoid duplication.
Re-indent grunt/.jshintrc.
Update less.js to v1.7.0.
Update grunt-contib-less.
Run `grunt`.
Merge pull request #12875 from twbs/less.js

Update Less.js