* Removes piston dependency.
* Adds dateutil dependency.

Fixes #183 - Implement /servers
Fixes #185 - Implement /images
Fixes #245 - Details in exception handlers
Fixes #249 - Metadata handling
Fixes #253 - Transition to OpenStack API v1.1
Fixes #255 - Fix XML for addresses
Fixes #287 - Piston related bug
Fixes #289 - Support both XML and JSON
Fixes #309 - GUI not refreshing
Fixes #339 - Support API extensions
Fixes #359 - action returns serviceUnavailable
Fixes #361 - return dates with timezones
Refs #301 - Sanitization of API
Refs #315 - Replace API v1.1