Admin views improvements

[jpmckinney]

Navigation

• Dropdowns in breadcrumb to switch between sections and questions

Views

• Always have edit links visible
• Don't use unstyled lists
• Distinguish the active simulator

Form

• Automatically fill the machine name if blank
• Add help text for form inputs http://getbootstrap.com/css/#forms-help-text
• Sanitize form values on submission (e.g. default and unit values with commas or currencies)
• If a value is changed, display its previous value