Transfer of all files from old repository.

Original: https://github.com/matthewtole/chameleon-500px
Remove Gecko submodule and add file downloaded from repo.
Rewrite index and settings HTML to match template code.
Update the manifest with changes made in previous commit.

Also modified the manifest to conform to WidgetGecko standards.

Bumped version to 0.2.0
Add missing Chameleon JS file from main widget page.
Minor bug fixes and tidy up of widget script.