Prepare for new version

Merge pull request #12 from stupergenius/add_carthage

Merge remote-tracking branch 'origin/develop' into add_carthage

Renaming macOS header definitions.

Adding carthage support to readme.

Fixing macOS build.

Adding platform targets.

Updating tests to not depend on the example app. Changing deployment target to iOS framework to 8.0

Adding recommended settings from xcode.

Initial project restructuring to support framework target.

Merge pull request #9 from dalu93/feature/perform-on

README and CHANGELOG updates

Minor changes

isStopped read-only from the outside

perform(on:_) first attempt