added optimized min/max, gave credit to bithacks
replaces lots of macros with stdlib funcs
Merge branch 'ceeplusplus' of https://github.com/rubicks/rendera into rubicks-ceeplusplus

Conflicts:
	Inline.H
Merge branch 'rubicks-ceeplusplus'
using the std:: prefix now, seems like the accepted way & looks cleaner, renamed SIGN macro to FAST_SIGN for clarity, removed mid method (don't need it)
updated readme
updated screenshot to show text tool
updated readme
removed underscores from var names (not needed anymore)
removed some leftover perrault octree stuff
removed some leftover perrault octree stuff
updated readme
Removed FAST_SIGN macro, it's not being used in a context where the 30% speed difference matters. I copied the macro to test/numerics.C so the test wouldn't break, but I think your sign method in Inline.H is plenty fast enough, so let's just use that.