Add ACL for dispatch job

UI Loading states

Better error state for allocation stats failure

404 pages for the UI

This is the only way to preserve the URL in all cases.

Update agent CLI to include Consul config option flags.

This update introduces command line flags for all Consul options
thus allowing users to both use a config file and CLI options to
configure Consul.

Website documentation has also been updated.

Closes #3304

This information is already loaded when traversing to an alloc row from
a job, but not when traversing to an alloc row from a node.

Ember tries to be clever by showing cached jobs instead of a loading spinner
in the event that a user starts on nodes, loads a couple jobs through
allocation relationships, then visits jobs.

Courtesy of SpinKit: https://github.com/tobiasahlin/SpinKit

UI empty states

Deployment.Allocations ACL enforcement

Deployment.List ACL enforcement

Deployment.SetAllocHealth ACL enforcement

Deployment.Promote ACL enforcement

Deployment.Pause ACL enforcement

Deployment.Fail ACL enforcement