bumped marketing version and podspec to 2.0.1 and build number to 28

bumped marketing version/podspec to 2.0.0, build number to 27

bumped marketing version/podspec to 1.19.0, build number to 26

bumped marketing version to 1.18.1 and build number to 25

bumped marketing version to 1.18.0 and build number to 24

bumped marketing version to 1.17.3 and build number to 23

bumped marketing version to 1.17.2 and build number to 22

bumped marketing version to 1.17.1 and build number to 21

bumped marketing version to 1.17.0 and build number to 20

moving to github