Implement ellipsoid.ellbndr_3dmat and ellipsoid.ellbndr_3d methods as well as tests testDimension, testConstructorProps and testPropertyGetters from elltool.core.test.mlunit.EllipsoidTestCase, elltool.core.test.mlunit.EllTCMultiDim, elltool.core.test.mlunit.HyperplaneTestCase from ellipsoids project

[irublev]

Deadline is 23/Dec/2018

For ellipsoid.ellbndr_3d a test checking that its result fully coincides with the one returned by the original function in Matlab should be written. For this this method should be launched in Matlab for some initial data, the outputs are to be saved in MAT file, in Python the corresponding test should load MAT file and check the results are the same.