ENH: Updating SimpelITK version to 0.7.0.dev54
Created by: blowekamp
This update to SimpleITK includes the following: Fix for mantis 3157 Improved compilation time with parallelism Improved VS9 compiler check Windows numpy size conversions fix
Additional tweaks to external file include: Adding cmake flag to remove git hash for version. Adding cmake variables for git tag and url.