Fix to share feature

Under the cover revision

Fixed minor problem with old content.

* Added back button

* Fixed minor problems with iOS13

* Updated for compatibility with iOS 10 and above.
* Improved usability and sharing.

* iOS7 compatibility

* New and improved user interface
* New Modern Army Combatives Program
* Twice as much content as before
* Video clips
* Fitness calculators

* Improved memory management and bug fixes

* Cleaned up content and images.
* Now supports iPad as well as iPhone and iPod Touch
* Improved navigation and search