Added import/export functionality for deployments

This commit makes it much easier to reproduce deployments based on prior ones.

Deployment export is based on the deployment summary page, but output format
is yml, and internal IDs are removed, in favor of puppetclass names and Staypuft::Role
names, in order to ensure that the format is portable across deployments and
across foreman instances (assuming Role/puppetclass names are the same).

Import pulls a previously exported deployment param set into an existing deployment object.
commits from jrist "Import and button cleanup for deployment UI"

and "Move configuration into a dropdown"
Better popover logic and fixed a few erb bugs

Fixed up the javascript

Left placement of import popover
Remove redundant 'config's
Fix formatting
Merge pull request #124 from sseago/deployment-import-export

This commit makes it much easier to reproduce deployments based on prior ones.

Deployment export is based on the deployment summary page, but output format
is yml, and internal IDs are removed, in favor of puppetclass names and Staypuft::Role
names, in order to ensure that the format is portable across deployments and
across foreman instances (assuming Role/puppetclass names are the same).