Add option 'region' to DataCenter#create (ProfitBricks API 1.2)
Add option polling_interval for configuring the interval length when polling
Merge pull request #9 from smarchive/configurablePollingInterval

Make polling interval configurable
Merge pull request #8 from smarchive/dcRegion

Add option 'region' to DataCenter#create
Preparing release of 0.9.7