Cleanup of Launch Configurations landing page.  Pull in missing EC2ResponseError import for delete operation.  Misc. PEP8 fixes.
Initial progress on Create Launch Configuration wizard.  Create new shared BlockDeviceMappingItemView to share with Launch Instance wizard.
Fix circular import.
More progress on Create Launch Configuration wizard.
Handle launch configuration creation.  GUI-292
Unit test for create launch config form.  GUI-292
Merge pull request #60 from eucalyptus/launch_configs

GUI-292: Create Launch Configuration Wizard