TemplateEditor improvements

* Combine filename input and file chooser dropdown, for full-width Template Editor
* Start a new template (and warn) when linking to an un-found Template
Add optional "help" parameter for Handlebars form helper "wrap" fn
Design updates

* Switch to fluid layout
* Check permissions in main nav ("administrator" to see Templates, Routes, Users)
* Tweaked color scheme
* Responsive "Menu" button on skinny screens
* Add new logo
Routes improvements

Tweak style to Template link and switch to use Edit button (clearer)
Allow ? and * in Route
Add pending as a status type
Send error if can't render 'index' as error (we already call next() if catchAll is true
Clean up hasRole a bit, provide {{else}}
Add defaults to File client model