Lower resolution of roof slopes/corners from 256 to 16.
forgot to check for proper tiling between segments.  fixed.
Made all gates open/close any gates above and/or below if same type.
Reduced hear distance for doors and gates
Only remove fences and signs from inventory if expected
Merge pull request #21 from Zeg9/signs

In creative mode, don't remove fences and signs from inventory when you place them
fix duplication bug in lighting (forgot to return itemstack)
fixed missing itemstack fields in on_rightclick calls in lights/doors
Fixed missing check for ownership/node protection in lights
made lights check for buildable_to instead of just air