Default settings of fubu new command should create an web application

I found the default behavior of fubu new to be difficult for someone like me approaching it for the first time. Currently the default behavior of ```fubu new``` is to create a blank solution. I kept hearing ```fubu new``` is the way to go. So the first thing I did was grab the **fubu** gem and run it with no arguments. 

![fubu](http://cl.ly/image/0b3f331y2V0i/Image%202013-11-04%20at%209.26.08%20AM.png)

From this usage it seems correct to do a ```fubu new``` So I do that and end up with no project just a solution. 

Later on Twitter Jeremy tells me about ```fubu new --app```. Great but how from the usage above is one to figure that out? Ah ```fubu help new``` to the rescue.

Only then do I learn that there is an optional flag to set for generating an app. IMHO the reason that people would typically need a project generator for a web framework is to generate a web project. 

This PR is proposing that the default be to create a web application and that the flag ```fubu new --empty``` or something similar be the optional argument that allows creation of an empty solution.