Adding WarpImageFilter

Change-Id: I065c2b78936fd8812cbdceb0edb3b8464060d668
Merge branch 'SIMPLEITK-432_UpdateToITK4.5' into SIMPLEITK-433_AddWarpImageFilter

Change-Id: I0ce6bb907f2e9392a54e556528c64108816d7493
To find data file search source tree after external data.

Change-Id: Id4185043da9528ce191fe18126b11259949891d8
Adding basic test for warp image filter

Change-Id: Ide2eb847354af476e3083ee29ef6b4a171e3e273
Merge topic 'SIMPLEITK-433_AddWarpImageFilter' into next

6312b66 Adding basic test for warp image filter
814e073 To find data file search source tree after external data.
2124425 Merge branch 'SIMPLEITK-432_UpdateToITK4.5' into SIMPLEITK-433_AddWarpImageFilter
0d3f327 Adding WarpImageFilter