Adding Cathy to the authors.
Adding a bit more text to front page.
Don't remove all html files before rebuilding.

This broke down, for example, when just rebuilding index.html with
"make index.html
Extending the rtc-video-chat example with a html page for clarification.

Closes #14.
Don't delete tutorial files either when just recreating a simple tutorial page.
Properly use Makefile for dependency checking before rebuilding.
Remove glue references.
Add a data channel example.
Add the data channel example to the tutorials.
Add WDCNZ presentation to tutorials.
Add some more about the presentations to the tutorials page.
Oops, missing some js files in these examples.
Updating the simple-text-share.js example.

I'm including the creation of the textarea.
Closes #14
Merge pull request #15 from rtc-io/silvia

Silvia