Added anchor highlighting, removed ajax update

* Anchors highlight when clicked
* Tab stays open if another anchor is clicked
* Ajax update commented out for now as causes a problem in Chrome iOS
Added highlight classes for anchors

Readme also updated to reflect color classname addition and changes.
Minor changes to highlighted classes
Tidy up and fixing IE/Firefox issues

Now works properly again in IE 10 + and Firefox, and also tidied up
some code formatting.
jQuery parity with Javascript version

Added highlighting and scrolling effects to jQuery version.
Updated readme to reflect Chrome iOS issue
Merge branch 'scroll-to-anchors'