fixup issues 440 441 479
cmd buffer overflow test simplified
Fix handling of platform specific path separator (fixes #651).
Implement norm() function to find the length of a vector.
Add test cases for norm().
Add cross() function to calculate vector cross product.
Merge pull request #655 from openscad/openscad-path-fix

Fix handling of platform specific path separator (fixes #651).
Merge pull request #656 from openscad/vector-norm-cross

Add vector norm() and cross().
Revert "Backported 2e3729ab2268f29ee4ff5898f629c4a10c2d6587 to master; redo assemblePath for Win. redo openscad.com to handle spaces in filenames"

This reverts commit 55192e46a4c0a977b7a9a35650b027c7a410ab14.
Merge branch 'master' of git://github.com/tim-caper/openscad into tim-caper-master
bugfix: Return boolean from ModuleCache::evaluate()
mac build fix: correctly link Cocoa to core libraries
Simple test of -D cmd-line parameter
Merge branch 'master' of github.com:openscad/openscad into issue235