AGNT-676 Create HTML5 test app

REQUESTING MERGE

AGNT-676[HTML5] Create an HTML5 test app that runs in an Android and iOS web view
https://crittercism.atlassian.net/browse/AGNT-676

The new "index.html" is essentially copy of "demo.html" from the HTML5 repo.
Old "index.html" kept but renamed to "rainbow.html".

Tested both iOS PhoneGap and Android PhoneGap versions of the "app" index.html on real devices.  Satisfying enough for pull request.  Some outstanding minor issues in Crittercism library and platform were discovered while testing (won't be fixed by this P.R.).