Added new functions:
setFontDirectory() Allow user to set font directory
showBoundingBox() Enable debug boundingboxes for characters/string

Changed bounding box colors to easily differentiate the two types. red=character, green=string
Get image suffix names from config.lua and let Corona handle the dynamic loading of image-sheets.
Merge pull request #1 from swipeware/Corona-dynamic-scaling

Let Corona handle the dynamic loading of image-sheets
Merge pull request #2 from swipeware/new-functions

Added new functions
Fixed a padding bug

Was crashing when using graphic character substitute
Doesn't crash if no imageSuffix