Add blank: false to required domain properties.
Reformat integration tests in ch03 source.
Update Hubbub to Grails 2.3.7.
Sync ch04 source with ch03.
Fix integration test to work with bootstrap data.
Sync ch05 source with ch04.
Update sample user data.

Three of the users have been replaced with chuck_norris, glen and peter. This
makes the source consistent with other parts of the book.
Fix size for Profile's photo property.
Add sample posts for Chuck.
Sync ch06 source with ch05.
Make home action default for PostController.
Remove premature test from PostControllerSpec.
Fix broken integration test.
Resync ch06 with ch05.
Test the home action rather than index for PostController.
Sync ch07 source with ch06.
Fix various issues with ch07 source.
Add login controller to ch07.
Made the user registration form nicer looking.