add .spr to font sprites (closes #44), start attempt to reference small and large by symlings (#36)
implement support for .font files which are text files that contain an absolute or relative path to a font directory, thus allowing aliases for fonts, closes #36
remove extraneous lines in manifest
fix number bug
add colon character
Merge remote-tracking branch 'origin/dev/jpsnyder/led/font_name'

Conflicts:
	Makefile