Added basic support for justify

This is a basic first pass to adding support for text-align: justify to the balance-text project.  Instead of using a complex algorithm for justification, it checks the element to see if it has a "text-align: justify;" property set, and if so, will add (n)px to a div tag per row to the "word-spacing" css property where n is the number of pixels that would best fit the container width.