Improvement of font functionality

**Additions** 
* Font:getWidth(text)
* Font:getHeight()
* Font:getWrap(text, width)
* Fonts are now loaded automatically (no need to load them in css)
* Added an example for font functionality

**Changes**
* love.graphics.printf() now wraps words
* Fixed love.graphics.print() printing too far down
* Loading ?/init.lua
* RandomGenerator.random([[min, ]max]) now returns integers when called with arguments