Fix nested describes in 1.8

Add relaxed regexp to allow whitespace that comes with the nested describes.
This is needed because the error messages are different between 1.8 and 1.9/2.0.
Add 1.8.7 back to travis
Add ruby 2.0.0 to travis
Update 1.8 info in README
Version bump for 0.9.2 release
Merge branch 'migration_generator'