Add script to test rendering of exported CSG files.
Fix CSG output of offset().
Disable inf/nan cases for *.csg import tests.

The inf/nan tests fail when exporting CSG and rendering that output again
as currently inf/nan is written directly to the CSG file (e.g. r = inf)
which is not valid or even misleading in case a variable inf exists.
Merge branch 'master' into csg-import-tests
Put tests in correct test config
Speed up 3D hull() slightly by avoiding converting the result to Nef
Speed up 3D convex hull() by a few orders of magnitude by using a more suitable kernel
Change order of dependency builds to avoid picking up the wrong dependency
Updated include guards to #pragma once
Merge branch 'master' into csg-import-tests
bugfix: FindGLIB2 didn't clean up properly. added new pkg-config utility functions which can be reused
Merge branch 'master' into csg-import-tests
Merge pull request #797 from openscad/csg-import-tests

Csg import tests
Use shared_ptr instead of managing memory manually
Add use and include to syntax highlighting. Also prime dynamic keyword expansion
Remove dependency on cl by substituting incf for setq, and fail-fast if there is a problem during indentation
Merge pull request #807 from Lenbok/scad-mode-improvement

Improvements to the emacs scad-mode
Merge pull request #808 from Lenbok/issue-438-cl-dependency

Remove dependency on cl from scad-mode
kill warning
Ubuntu 12.04 build fixes