Merge pull request #293 from GreatFruitOmsk/master

Add proper quick look plugin for STL.
Add ignores suggested by smorloc
Add power python module to package script.
Update cura.bat for new format, remove printrun.bat as we do not ship with printrun anymore
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Fix the rounding bug when using 1.2mm wall thickness.
Fix the default example path, and add support for version file in frozen build.
copy the cura examples from the proper location.
Merge branch 'master' of https://github.com/daid/Cura
Keep the example and firmware data in subdirectories.
Fix the double click on STL/OBJ files.
Fix starting the printing interface under windows and linux.
Fixed #299
Add missing exception on error messages.
Update print window to use multiprocessing instead of starting our own subprocess.
Remove debug messages.
Revert the multiprocessing, as multiprocessing with wxPython does not work for MacOS
Added minecraft import tool.
Add relative extrusion distance to GCode viewer, and let dimension export M83 on relative extrusion.
Only show the minecraft import when you have minecraft installed.
Add full screen option for MacOS.