Added some items to TODO

Author: diara628

TODO

@@ -1,12 +1,19 @@
-Code that could be included:
+Code that could be integrated:
 * http://github.com/l0b0/qr2scad
 * http://github.com/l0b0/img2scad
 * http://github.com/l0b0/OpenSCAD-Minimizer
 * http://www.thingiverse.com/thing:4656
 * http://www.thingiverse.com/thing:4758
+* http://www.thingiverse.com/thing:6021
 
 Integrate these better:
 * bitmap
 
 Testing:
 * add tests for openscad functions
+* motors.scad
+* tests for 2D stuff
+
+Code style:
+* motors.scad
+* nuts_and_bolts.scad