v0.2.1, 05.07.13 -- Initial Release
v0.3.1, 06.12.13 -- Added support for Hershey Fonts (Matthias Blaicher)
v0.3.2, 11.12.13 -- CellArray now supports non-orthogonal spacing
                 -- Block uses attribute .spacing
                 -- Use git_version for automatic distribution numbering from git tag
v0.3.3, 11.12.13 -- git_version module now included in distribution
v0.3.4, 11.12.13 -- fixed git_version absent from MANIFEST
v0.3.5, 11.12.13 -- automatic version numbering now correctly updated gdsCAD.__version__
v0.3.6, 12.12.13 -- fixed installation to include missing resource files
v0.3.7, 14.02.14 -- More colors for layer numbers greater than six (Matthias Blaicher)
v0.4.0, 19.05.14 -- Make only cells with conflicting names unique during saving.
                    This change effects the API of the Layout.save() call.
                 -- Use numpy for conversion to GDS internal coordinates while saving
                 -- Fixed Elements constructor for 1-element lists
                 -- Track references to Elements and CellReferences separately
                 -- Cache bounding box property
                 -- Removed .uniquify_names methods. Uniqification is applied 
                    if and only if the name has a duplicate
v0.4.1, 05.06.14 -- Allow Boundaries with unlimited number of points via multiple XY entries
