Fixes #128

Cleanup nfs export deletion code to make it idempotent. Sometimes, due to
business of the mount things don't happen right away.
Fixes #35

Separate our urls into their own files.
Update cli for new url changes
Update webui for new url changes
Merge pull request #258 from schakrava/issue#128

Fixes #128
Merge pull request #259 from schakrava/issue#35

Issue#35