Merge pull request #1 from craig-cobb/master

Added optional users paramater to create_instance call.
Merge pull request #5 from calebgroom/master

Always specify an Accept Header
Merge remote-tracking branch 'slade-upstream/master'
Merge pull request #2 from cgroom/master

Sync with upstream, pull in new commit to work post-repose
remove api-key auth from delete instance
Add Sydney and Staging to Regions
Merge pull request #3 from ziad-sawalha/regions

Add Sydney and Staging to Regions