Merge pull request softlayer#38 from briancline/new-clusters

Updates DC list and allows unknown DC designators

Merge pull request softlayer#30 from briancline/release-0.5.2

Bump version to 0.5.2

Version bump to 0.5.1

Version bump to 0.5.0

Version Bump

Merge pull request softlayer#4 from sudorandom/master

StorageObject.list() to use prefix