Use new CSS naming scheme for button types in RTE link overlay dialog
Fix RTV init for browsers that have re-entrant load event on doc.close
Check browser is returning a sane scroll height in expanding TextView.

Presto (old Opera) returns 0 immediately after inserting into document.
More ES5 polyfills into IE8 patches module.

Closes #6.

All other browsers still even vaguely in use implement these natively.
Merge pull request #5 from explorigin/master

Add build instructions