NSDate attribute default value code update

- NSDate attribute default value code update
- Updated podspec version

* NSDate attribute default set to approx 1000 years into the future, instead of using today for the default.  This is to better handle the case of APIs that use nulls for (for example) no expiration-date situations.

Signed-off-by: Darren Ehlers <me@darrenehlers.com>