Turn this conditional around the right direction.
Add an option to only draw if the meta is less than some value
Clip to tile boundaries when stitching.

Prior to this, lines that crossed the tile boundary would get
drawn twice, once for each side, and would end up brighter
as a result.
Uninitialized variable!
add dependencies and install instructions to the readme
Merge pull request #6 from springmeyer/readme-fixes

Add dependencies and install instructions to the readme
Add do-nothing setClip to make it compile again
Clean up readme intro
Add single zoom documentation
Merge pull request #10 from aaronlidman/master

Add single zoom documentation
Clarify Gaussian brush documentation
Add an option to let meta colors fully saturate to white.
Add example of subshell invocation from xargs
Make vector output compile again
Merge branch 'master' of https://github.com/ericfischer/datamaps
Merge branch 'master' into v2

Conflicts:
	graphics.h
	render.c