Update plugin to version 2.8.6
Update plugin to version 2.8.7
Merge branch '3.x'

Conflicts:
	bower.json
	jquery.mCustomScrollbar.concat.min.js
	jquery.mCustomScrollbar.js
	js/minified/jquery.mCustomScrollbar.min.js
	js/minified/jquery.mCustomScrollbar.min.js.gz
	js/uncompressed/jquery.mCustomScrollbar.js
	readme.md
Update plugin to version 3.0.0
css bugfix

this bug will raised sass syntax error.
Merge pull request #166 from yfxie/patch-1

css bugfix