Merge pull request #21 from dschreij/master

Added OS X homebrew install instructions
Fix invalid URL in source page
Update development info
Update publications
Add Christmas notification
Add common-items page
- First pass at item-specific help page
- Rename plug-ins installation page
First pass at included source-code-structure description
Update for 2014
Add architecture page
Add auto-generated archictecture list
Update publications and notification
Add Cambridge tutorial (hidden)
edit and 'unhide' Cambridge tutorial
slightly updated information on edwin
Merge pull request #22 from esdalmaijer/master

Cambridge tutorial
Update publications
Update usage/variables-and-conditional-statements
Add miscellaneous/runners
Update notification for 2.8.0