Changed references to `SQKDataImportOperation` to `SQKCoreDataOperation`
Merge branch 'release/0.5.0'
Fix for syntax error in podspec preventing linting.

Single quotes were used to specify the git tag number and these do not
support string interpolation. Ruby was crashing and the lint was failing.
More info here:
https://github.com/CocoaPods/Specs/issues/12601#issuecomment-53093738
Example project pod update.
Replaced #imports with @imports for frameworks, added missing UIKit import (fixes #18).
Version bump.
Merge pull request #20 from 3squared/master

develop behind master
Updated Podfile to allow example project to build.