BUG: make itkTriangleHelper instantiable to ease wrapping
BUG: make itkTriangleHelper instantiable to ease wrapping

Technically itkTriangleHelper doesn't need to be instantiated
since all of its methods are static. However, with C++11 swig
fails to wrap it unless it can be instantiated. The easiest solution
is to allow itkTriangleHelper to be instantiated.

Change-Id: Iec434816e2017fae47d9459944313cf5b24656cf

hjmjohnson/ITK,malaterre/ITK,PlutoniumHeart/ITK,BRAINSia/ITK,spinicist/ITK,thewtex/ITK,blowekamp/ITK,LucasGandel/ITK,PlutoniumHeart/ITK,LucasGandel/ITK,vfonov/ITK,richardbeare/ITK,hjmjohnson/ITK,LucasGandel/ITK,vfonov/ITK,spinicist/ITK,InsightSoftwareConsortium/ITK,stnava/ITK,LucasGandel/ITK,malaterre/ITK,richardbeare/ITK,blowekamp/ITK,fbudin69500/ITK,fbudin69500/ITK,spinicist/ITK,PlutoniumHeart/ITK,blowekamp/ITK,spinicist/ITK,PlutoniumHeart/ITK,PlutoniumHeart/ITK,spinicist/ITK,blowekamp/ITK,thewtex/ITK,LucasGandel/ITK,malaterre/ITK,stnava/ITK,vfonov/ITK,blowekamp/ITK,LucasGandel/ITK,blowekamp/ITK,vfonov/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,PlutoniumHeart/ITK,spinicist/ITK,spinicist/ITK,thewtex/ITK,fbudin69500/ITK,malaterre/ITK,BRAINSia/ITK,hjmjohnson/ITK,spinicist/ITK,vfonov/ITK,stnava/ITK,richardbeare/ITK,fbudin69500/ITK,malaterre/ITK,InsightSoftwareConsortium/ITK,thewtex/ITK,stnava/ITK,BRAINSia/ITK,LucasGandel/ITK,Kitware/ITK,malaterre/ITK,fbudin69500/ITK,Kitware/ITK,richardbeare/ITK,spinicist/ITK,BRAINSia/ITK,thewtex/ITK,hjmjohnson/ITK,blowekamp/ITK,Kitware/ITK,Kitware/ITK,richardbeare/ITK,Kitware/ITK,stnava/ITK,malaterre/ITK,thewtex/ITK,hjmjohnson/ITK,hjmjohnson/ITK,hjmjohnson/ITK,vfonov/ITK,BRAINSia/ITK,BRAINSia/ITK,PlutoniumHeart/ITK,thewtex/ITK,fbudin69500/ITK,PlutoniumHeart/ITK,malaterre/ITK,malaterre/ITK,stnava/ITK,InsightSoftwareConsortium/ITK,richardbeare/ITK,vfonov/ITK,InsightSoftwareConsortium/ITK,stnava/ITK,vfonov/ITK,fbudin69500/ITK,stnava/ITK,InsightSoftwareConsortium/ITK,InsightSoftwareConsortium/ITK,stnava/ITK,richardbeare/ITK,blowekamp/ITK,BRAINSia/ITK,vfonov/ITK,Kitware/ITK,LucasGandel/ITK,fbudin69500/ITK