Front-end bits and pieces

As I was preparing to starting adding in Angular JS stuff:

* Implements an earlier proposal of yours to extend the `fab develop` task to install all dependencies
* Sets the right (latest stable) versions of angularjs
* Brings back the old `deploystream` "marketing" page. Not sure where this will end up living (this kind of stuff works better as pre-compiled static pages further down the line) but it will serve for a while. Choice of colors, graphics, background photos etc will come at some point.