Updated to GitBook 1.0

Some features missing. Easy linking to GitHub is the most important.
The anchors plugin also has poor formatting. Also, scrollable code
blocks plugin is no longer needed.
Added static github links

GitBook 1.0 removed these, added back in, but static. Need to find a
way of using the default git data, and set the edit link for the
current page. Or, add an “edit on github” link to the page itself
Reordering custom language topics
Cleaning up summary
Removed "how do I" page

Will replace with hints and tips
Renamed StyleGuide to CONTRIBUTING
Added what's new page
Details of Component Model changes
Advanced Component Model usage
Cardinality, overriding and replacing components
Fixed broken XML manipulation code
Zones work in progress