BUG: Must pass compiler to Insight ExternalProject.

Change-Id: Ibc8d59b91324abe92ecffd660f9294a7d00ed05f
ENH: Use the latest tag for SimpleITK.

Prevent movement on master.

Change-Id: I52e59083d18e888b66ace47716119e2081e25d18
ENH: Add TubeTK_USE_SimpleITK option.

Turn OFF by default for now because the amount of build time required.

Change-Id: Ifa2aecf904f9b60fa5f7cf2aa37cca1d1c22afc3
Merge topic 'SuperInsight'

2347a7f ENH: Add TubeTK_USE_SimpleITK option.
7ecf2bd ENH: Use the latest tag for SimpleITK.
d223627 BUG: Must pass compiler to Insight ExternalProject.