Eigenstrainmaterial derived from EigenStrainBaseMaterial (#4373)

r20256
Minor cleanup (#4373)

r27183
Moved _c definition out of EigenStrainBaseMaterial (#4373)

r28357
Implement d/dc for SimpleEigenStrainMaterial (#4373)

Marmot issue (#62)
Modify tensors in-place (#4373)

Marmot issue (#62)
Move c coupling to the correct class (#4373)

Marmot issue (#66)
Add test for SimpleEigenStrain (#4373)
Register SimpleEigenStrainMaterial (#4373)
Merge pull request #4375 from dschwen/simpleeigenstrain_4373

Add SimpleEigenStrain material