More page layout options

[stephentuso]

Now that in 1.0 the builder page method only takes a WelcomePage, rather than a bunch of different methods and parameters for each page type, it is much easier to add some more options. For the basic page, title page, and parallax page, I'm thinking the layout options would be the current (text on bottom, large image), text on top with large image, and more centered text with smaller image. Each class could then have a layout method that used an enum perhaps, and then a different layout file would be used based on that.