Merge pull request #998 from prebid/changes_for_2_2_3

Changes for 2.2.3

Merge pull request #984 from prebid/release-2.2.2

2.2.2 updates

Merge pull request #970 from prebid/2.2.1_pre_release_updates

Updates for 2.2.1

Carthage Release 2.2.1

Merge pull request #952 from prebid/prerelease-2.2.0

Changes for 2.2.0 release

Carthage

Merge pull request #935 from prebid/bump-to-2.1.6

Bump to 2.1.6

2.1.6 for Carthage