replaced 'youtube' template with actual iframe/embed code.
format index.html
added link to docs/samples/sample_input.html -- QUICK AND DIRTY
* added basic bandcamp template.   NOTE: bandcamp "id" is not (always?) extractable from URL.

* made samples into XHTML, so iframe markup can be put into CDATA , and strings can be more easily extracted for automated testing.
added vimeo template -- NOTE:  height & width not supported, yet.
implemented mechanism to specify, and then merge "default" properties into templates.