added gem railroady for creating db/controller diagrams
added page to db models
refactored history model
refactoring page model, fixing html work
reformated page partial
commented test gems
removed no more relevantentry in gitignore
better permissions with cancan
better 'not authorized' exception
removed unused code
comments in ability class
redirect to 'root' if 'not authorized'
fixed _shared partial for page
merged changes from master to page model
updates gems, refactored page model and user realtion
remove title method for compatibility with admin ui
fixed relation between user and page (ownership)
added doc for generating picture of models
many-to-many relations for users-pages