Fix tests.

0.3.11

Bump version.

New features. Bug fixes

1. Issue #7 add support for advertisingSettings document property.
2. Issue #7 add validation to AdvertisingSettings. Add tests.
3. Issue #10 add support for caption descriptor.
4. Issue #12 add support for videoURL in document Metadata.
5. Issue #14 support an integer value of 0 as a supported unit.

New features. Update document version to 1.2

Add support for Facebook Post, Vine Post. Bump APN document version to 1.2.