Fixed a bug in multisite where the plugin would default to the individual site settings even when Use Network Settings was checked. Also added whitespace trimming when saving API key. Bumpbed version to 0.2.1

git-svn-id: https://plugins.svn.wordpress.org/swarm-cdn/trunk@796105 b8457f37-d9ea-0310-8a92-e5e31aec5664