Add quantitative tests to itk::FastMarchingImageFilterBase.

[jhlegarreta]

Description

As mentioned in PR #114, the itk::FastMarchingFilterBase class would be better covered if the corresponding tests were quantitative (i.e. the output was compared against a baseline), and additional test cases were included.

Expected behavior

Improvement in the robustness of the class by:

• Making the tests quantitative adding some trial points.
• Testing non-identity spacing images.
• Testing on non-null origin images.

Actual behavior

No comparison against a baseline is done.
Default identity spacing and null origin images tested.

Reproducibility

%100.

Versions

ITK master.

Additional Information

This should be relatively easy to address.