Merge pull request #12 from chillpop/master

Unique foreign keys can use keypaths when importing
added travis badge
Update README.md
Expose persistent store file URL so it can be logged by the containing application if desired.
Bump podspec
*shakes fist at Travis*
Check the store URL instead of the existence of the filename to see if we have a store.
Merge pull request #13 from designatednerd/master

Log Facilitation
Added "deleteObjects..." method taking a predicate
bump podspec version