Bugs and features from https://github.com/serbanghita/Mobile-Detect/m…

…ilestones/2.8.13

Tablets regex fixes.

Fixes from users.

New Samsung tablets.

Improved the Amazon tablet list.

Minor fixes and some new tablets.

White space fix, exported JSON with the new rules.

New tablets.

Refactored unit tests.
Getting ready for the 3.0.0 beta.

Added Dell tablets and other minor brands.

New tablets, user fixes.

New tablets, fixed merges from users, researched new tablet codes and…

… unit tests passing.