Update grunt-contrib-uglify dependency.

BS3 commits: 5d35c4909c48a1953ea249e6d5ddd5677553b5a3
Template the customizer's nav sidebar too

BS3 commits: ebc4f998dccf0d709a143348c02777d9c4695abb
spacing

BS3 commits: 317aa8092dcbf182ef3bdcc8d0222096fc6a51ea
Fix 12298

BS3 commits: cd78b431856d451d5d21df0920685da05e1baa56
fix typo in README

BS3 commits: c658e4e926cc313de6cbadb8034d58ba0b79ed21
Update index.html

BS3 commits: 7938134fd1382deb7b300da1672559fe2afb3706