Basic tree tests added.
Very simple pyramid mesh for model tests added.
Fixed unit test: replaced getter call by property read.
Name property added to patch accessor.
Fixed division by null and correct result type on multiplication on vector class.
Moved vertex mapper class to own module.
Added tests for vertex mapper.
Renamed connection property to childConnections on patch classs and replaced shadow patch class by flap class.
Changed edge and face indexing on pyramid mesh sample OBJ file.
Added corner sample corner OBJ file for mesh to model testing.
Created mesh edge proxy class to partly implement mesh.Edge interface for bituple of coordinates.
Handle degenerate case of 0 length direction for edges.
Adapt patch accessor to connection -> childConnection renaming on implementaion class.
Renamed module test_collision -> detect_collision.
Fixed edge orientation related vertex mapping bug.
Added test stub for tree to model conversion.