Added a warning about the new IE9+ tests.

I really hate to do this, but the only other way I can think of doing
this is writing my own assertion library aimed at the browser that
doesn't catch fire in IE<9.
No longer remove listener array if last one.

This should make listener removal play better with RegExp based stuff.
Fixes #44.
Corrected the test suite.

Listener array should stay after the last listener has been removed now. #44.
Built the next RC for v4.1.0.
Fixed the documentation builder.

The helpers were moved to another repo which make the documentation go
weird. The types for arguments lost their separator.