quote attribute value in selector in JS docs example

BS3 commits: a6214273b9f9a7d4858e55ac2c5379f71ab71314
Update composer.json

BS3 commits: 58ab1c64c5989bf6755c0b224b0d1813656d0e76
Customizer: switch to UglifyJS2

BS3 commits: e0c3ae61333c76b5f1490f074c6558498d5e995d
grunt dist

BS3 commits: eaddbd92bb19f0ee7e04ae12736de4d49e33c925
add missing operators to some JSCS rules that we already comply with

BS3 commits: d971ddb730c5577bd533e7c598e2990c128b1265