Makefile: Create static directory automatically
Makefile: Convert hard-coded file paths to automatic variables in rules
Makefile: Use "cp -a" instead of the bare "cp"

I can't bear with the inconsistent modification times!
Makefile: Make CoffeeScript compiler create static directory by itself
Makefile: Use shorter forms in the rules
convert.py: Add a flag to set the format of the output image
.gitignore: Add .ttf to .gitignore