Add Match Highlighter add-on to lib/utils, a new demo showing it off, and modify index.html to link to the demo

Issue #382

Issue #376

toString.call([]) returns "[xpconnect wrapped native prototype]" instead of
"[object Array]" in this browser, for some unfathomable reason.

Closes #385
Closes #384

Closes #387

Closes #377

Optimized less mode.

This is a rather crude hack, but it seems to resolve the problem.

Closes #369

Works around an IE problem with an editor instance in an ifrace not
being focused by a call to focus().

Closes #367

Closes #303

This way, they can check some condition in the handler, and
drop through to the default behaviour (or some deeper
handler) when they want.

Triple-clicking on a line, or calling the selectLine() API, should include the newline character in the selection. This is consistent with line selection behavior in other text editors.

When exiting fullscreen: fallback on width and height set by css instead of recalculating, which was wrong anyway, when pressing F11 a couple of times the editor would decrease in width.

See http://hpccsystems.com

 for further information.

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>

You will confuse the outer HTML parser if you do really weird things,
though.

Closes #359

Removing dependency on jQuery, only allow `Esc` to *exit* full screen (rather than *toggle*), and changing class name to be consistent with CodeMirror class naming practices.