Update grunt-contrib-jshint to 0.11.0

[netweb]

Update grunt-contrib-jshint to v0.11.0

​https://github.com/gruntjs/grunt-contrib-jshint/compare/v0.10.0...v0.11.0

Patch includes exclusion for external library src/bp-core/js/jquery-scroll-to.js in .jshintignore otherwise various JSHint errors occur due to the updated usage of JSHint v2.6.

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I went looking to replace the BP customised version of src/bp-core/js/jquery-scroll-to.js with the original v1.4.12 source but things appear to not be all ok in that realm, attached is 6266-jquery-scroll-to.diff of the original source if you wanted to go down that route:

• v1.4.12 Source: ​https://github.com/flesler/jquery.scrollTo/blob/1.4.12/jquery.scrollTo.js

[djpaul]

In 9566:

Tools: update grunt-contrib-jshint to latest version, and add an existing third party script to JSHint ignore list.

With the new version of JSHint, jquery-scroll-to.js reports errors relating to unused functions.
For now, add this legacy script to the ignore list so that the Grunt build tasks pass.

Fixes #6266, props netweb

[DJPaul]

I can't remember what we've done to poor jquery.scrollTo.js without looking, but it sounds like our version is modified and out of step. It would be nice to update it, but I think we should open a separate ticket and investigate doing that.