Add Not compount validator and tests
Update documentation a tad
Merge pull request #5 from twotoasters/not-compound-validator

Add Not compount validator and tests
Implement key-value coding validator
Fix bugs in the KVC validator and add some docs
Removed TWTValidatingObject. Added docs for KVCValidator
Added a quick note about -copy
Send twt_validatorsForKey: to object's class, not object
Cache nil validatorsForKEY result as NSNull instance
Merge pull request #6 from twotoasters/kvc-validator

Kvc validator
Document value validators
Start implementing value validator tests
Add equality test for value validator
Complete value validator tests
Add tests for TWTNumberValidator
Change string validator method signatures