Merge pull request #115 from burstly/dev

Adding click test 3
Merge pull request #116 from burstly/dev

added tracking pixel img
Merge pull request #117 from burstly/dev

Added cache buster to image url
Merge pull request #118 from burstly/dev

Use custom destination
Merge pull request #119 from burstly/dev

Add click test 5
Test 9/20 #1
Test 9/20 #2
Test 9/20 #3
Updated iOS release notes for 2.4 patch