Fix: shape coordinates close to 0 now absolutely 0
Fix: shape coordinates close to 0 now absolutely 0

Check wether the values are close to zero by checking if it lies between
-0.00001 and 0.00001. If this is the case, set the value to 0. This prevents
coordinates like 7.10543e-15, that are differ by platform.

ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz