added GenerateSDFDeadReckoning method, font-effects sample now has a decent outline
Merge branch 'feature/glyph-padding' of https://github.com/patrickmeehan/moai-dev into feature/glyph-padding

Conflicts:
	src/moai-sim/MOAIImage.h

Need to make font-effects sample work again
changed font-effects sample main.lua to work after merging in patrick's changes
Added outline color and outline width fields and set methods to MOAITextStyle
Changed GenerateSDFDeadReckoning() to take a threshold value and snap the value to 0 if its greater than the threshold. Default threshold value is 256.
Added new GenerateOutlineFromSDF method to allow for drawing the outline without the use of a shader
Added new getOutlineWidth and getOutlineColor methods, also tweaked the GenerateOutlineFromSDF function slightly