Fixed a little thing in licenses text loading and added some methods for customization

- Added methods to use custom dialog theme and divider color and tweaked license text parsing
- Fixed bug in show() and createAndShow() methods and optimized code
- Readded wrongly removed code
Replaced LicensesDialog constructors with builder, removed SingleLicenseDialog as it is now handled by the builder
Added custom theme samples and splitted divider color methods.
Update README.md
Improved titleDividerColor code and increased min API level to 8
Merge pull request #34 from PSDev/pr/30

Added methods for customization