[Radiant] Radiant Help Extension

[Jim Gay]

I've been working on ideas for a help system for Radiant and have  
tagged version 1 of Help on github:

http://github.com/saturnflyer/radiant-help/commits/v1

You can easily create help information for extensions by providing  
files with the appropriate information, or by injecting partials into  
the help interface. There is no database dependency so extension  
authors may safely provide documentation that will easily work with or  
without Help installed.

A previous version (the 'legacy' branch) required db migration and is  
obsolete, but I may resurrect ideas from there into an additional  
extension.
Future versions will have a cleaner interface, screenshots for better  
info, javascript enhancements, etc.

For other extensions that I use, I may write some HELP docs and send  
pull requests to the owners. Sean's recent message about the  
share_layouts extension seems like a great way to use this. All that  
needs to be done is to write up the documentation in a file called  
HELP_developer.markdown or HELP_admin.textile (for example) and  
whomever uses the extension will have all the necessary info either in  
the source, or right there in the Radiant interface if they have Help  
installed (displayed based on the user's role).

For details on using it, see http://github.com/saturnflyer/radiant-help/tree/master/HELP_developer.rdoc