Added info about developing MCAD and other improvements to README

README

 OpenSCAD MCAD Library
 =====================
 
-This library contains components commonly used in designing and moching up mechanical designs. It is currently unfinished and still undergoing considerable API changes however many things are already working.
+This library contains components commonly used in designing and moching up
+mechanical designs. It is currently unfinished and you can expect some API
+changes, however many things are already working.
 
 This library is licensed under the LGPL 2.1
 See http://creativecommons.org/licenses/LGPL/2.1/ or the included file, lgpl-2.1.txt.
 
+== Usage ==
+You can import these files in your scripts with "use <MCAD/*.scad>", but some
+files include useful constants which will be available with "include <MCAD/*.scad>",
+which should be safe to use on all included files (ie. no top level code should
+create geometry).
+
+
 Currently Provided Tools:
 
 * involute_gears.scad (http://www.thingiverse.com/thing:3575): 
@@ -31,7 +40,27 @@ Utils:
 * constants.scad: mathematical constants
 * curves.scad: mathematical functions defining curves
 * units.scad: easy metric units
-* utilities: geometric funtions and misc. useful stuff
-* teardrop (http://www.thingiverse.com/thing:3457): parametric teardrop module
+* utilities.scad: geometric funtions and misc. useful stuff
+* teardrop.scad (http://www.thingiverse.com/thing:3457): parametric teardrop module
+
+== Development ==
+You are welcome to fork this project in github and request pulls. I will try to
+accomodate the community as much as possible in this. If for some reason you
+want collaborator access, just ask.
+
+Github is fun (and easy), but I can include code submissions and other
+improvements directly, and have already included code from various sources
+(thingiverse is great :)
+
+=== Code style ===
+I'd prefer to have all included code nicely indented, at least at the block
+level, and no extraneous whitespace. I'm used to indent with four spaces as
+opposed to tabs or other mixes of whitespace, but at least try to choose a style
+and stick to it.
 
-You are welcome to fork this project in github and request pulls. I will try to accomodate the community as much as possible in this.
+=== Testing ===
+I've started a minimal testing infrastucture for OpenSCAD code. It's written in
+python and uses py.test (might be compatible with Nose also). Just type py.test
+inside the lib dir in a terminal and you should see a part of the tests passing
+and tracebacks for failing tests. It's very simplistic still, but it should test
+that no syntax errors occur at least.

teardrop.scad

@@ -26,3 +26,5 @@ module test_teardrop(){
     translate([0, 0, 0]) teardrop(5, 20, 60);
     translate([0, 15, 0]) teardrop(5, 20, 45);
 }
+
+//test_teardrop();