Merge pull request #22 from appendto/group-msg-readme

Group msg readme
Link to group messaging README from main README
Clarify that Node.js is needed for development
Merge pull request #1 from pho3nixf1re/update-readme

Link to group messaging README from main README
temporarily fixed readme so that it does not lie
links to requirements
readme localhost link
Fix non-injected URLs to be relative
Use fork of grunt-injector and re-inject scripts

The use of the grunt-injector fork should be considered temporary until
the open PR is accepted upstream.
Add npm test script runner
Updated README to be more clear and include the license from package.json
Better build commands in grunt and gh-pages publishing
Point to index.html files to allow better running with no webserver
Change wording around starting the Node server and watching for changes
GitHub Pages are case sensitive, show respect
README tweaks and additions for completeness