release of Flurry 2.2.1 adapter SDK 4.2, containing Flurry Interstitials beta
removed adapter from beta releases directory structure - as the adapter in STABLE RELEASE contains BETA for Flurry Interstitials
Merge pull request #20 from hkosacki/update_flurry_4.2.0

[132504151] Release of Flurry 2.2.1 adapter SDK 4.2