Change gemspec activerecord dependency to 3.2.8
Harvest some spec code from squeel

https://github.com/ernie/squeel
Basic working tests for ActiveRecord 3.2.8
Updated Gemfile, .gemspec and Rails environment vars
Gem tests pass using Rails 3.2.9
Gem tests pass using Rails 3.2.10
Clean up Gemfile
Update for AR 3.2.11
Allow uuid to be specified during initialization but not changed once object is persisted.
Merge remote-tracking branch 'terriblelabs/master'

Conflicts:
	lib/active_record/uuid/model.rb
Use AR ~> 3.2.x