Interim update

- Added initWithCoder to DNButton
- Fixed setTintColor in DNThemeManager for DNButton
- Updated podspec version

Signed-off-by: Darren Ehlers <me@darrenehlers.com>
Added DNDataModel multi-threaded context support

- Added DNDataModel multi-threaded context support
- Move CommAPI blocks to background threads
- Added AttributedStrings to DNButton theming
- Added initWithCoder to DNButton
- Fixed setTintColor in DNThemeManager for DNButton
- Updated podspec version

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