refactor include page/box integration
refactors the way we include common behavior for pages, boxes and resources
Merge branch 'feature/model-include' into develop

* feature/model-include:
  refactors the way we include common behavior for pages, boxes and resources
  refactor include page/box integration
names content page example consistently
uses generated attributes instead of overriding the getters
adds preset_value option to the attribute generator
fixes attribute generator tests
Merge branch 'feature/preset-attribute-values' into develop

* feature/preset-attribute-values:
  fixes attribute generator tests
  adds preset_value option to the attribute generator
Bugfix: newrelic generator now differentiates between deploy key and api key

+ fixes #46
adds preset_attributes and mandatory_attributes option to the model generator
updates CHANGELOG
refactors airbrake into error_tracking generator
checks that the deploy key is used in after_restart.rb
bugfix: container needs to delegate to a page
Merge branch 'develop' into feature/blog
* added search functionality
* added pagination
* bugfixing
added test spec for the blog_generator
fixed bug in the rss-feed view of the blog
added USAGE file