Implement caching of ignored keys
Test for ignore
Only log unknown key warnings once per key per class
No need to log warning synchronously
Merge pull request #12 from Raizlabs/feature/ndonald2/ignore-keys

Add support for ignoring keys on import
Add keypath import support
Update comment
Update README
Fix ignoring of keypaths
Fix collection type
Unknown mapping warnings should be cached relative to class
Merge pull request #13 from Raizlabs/release/1.1.0

Release Candidate for v1.1.0