Merge pull request #10 from SignalK/master

Merge updates via master into gh-pages
Merge branch 'gh-pages' of github.com:SignalK/specification into gh-pages
Merge pull request #13 from SignalK/master

Add signalk header
Update index.html
Update index.html
Update index.html
Merge pull request #14 from SignalK/gh-pages

Try to add headers