Remove all old .gitkeep files and replace them with Rails 4's .keep files
Update the error pages and robots.txt file for Rails 4
Add jbuilder templates generated by Rails 4 scaffolds
Add the jbuilder gem
Delete some files that are no longer created in new Rails 4 apps
Update some comments and code that are changed in new Rails 4 apps
Rename the GoogleBookData model to GoogleBookDatum
Update comments and whitespace in controllers for Rails 4
Update code style and method calls in controllers for Rails 4
Fix using the wrong instance variable names in the set_* methods of controllers
Merge branch 'master' into rails-4-updates
Merge pull request #1 from rit-sse/rails-4-updates

Rails 4 updates