Modify NRRD reader to handle ASCII encoding.

Change-Id: I9f15e2be8ffbe6cd14171fdec2795d28fa6418fb
Add test for NRRD Reader.

Change-Id: If2bb7cdfc2b3df212c2c3d5c0733c8157bacd90d
Minor compile fixes.

Add algorithm include for transform function.
Get the case correct for vtkActor2D.h.

Change-Id: Ie95b5971c96b0b7d94c5a726f37c20f9768da346
Merge topic '13844-nrrd-ascii' into master

aa4b1aa6 Minor compile fixes.
68fd5bc4 Add test for NRRD Reader.
eb27d367 Modify NRRD reader to handle ASCII encoding.