updated podspec to point to 6.0
Merge pull request #52 from barrettj/master

Updated podspec to point to 6.0
Add ZZConstants.h to public headers
Podspec version update from 6.0 to 7.0

Update podspec version from 6.0 to 7.0.
Release version (tags) are mapped to a certain commit.
6.0 is mapped to 7fe656b

Cocoapods clones that commit in stead of c27f9e1 - the one that has the
latest podspec and the AES encryption support.

Updating the podspec version to 7.0 and creating a new release (7.0)
would allow CocoaPods to clone the correct version.
Merge pull request #54 from cyupa/master

Update zipzap.podspec