Bumping version to 2.2.1

Updating CHANGES

Bumping version to 2.2.0

Bumping version to 2.1.0

Bumping version to 2.0.3

Bumping version to 2.0.2

Fixing podspec

Bumping version to 2.0.0

Revert "[Issue #1206] Fixing checks for network reachability flags ov…

…er WWAN"

This reverts commit 7117142.

[Issue #1322] Fixing implementation of download task delegate callbacks

Bumping version to 2.0-RC2