Added vtk build script

scripts/thirdparty/_VTK.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# VTK
+echo "Building VTK ... "
+
+echo $PLATFORM
+
+if [ "$PLATFORM" = "travis" ]; then
+	echo "Travis: Using docker VTK build"
+else
+	git clone https://gitlab.kitware.com/vtk/vtk.git -b v8.2.0
+	cd vtk
+	mkdir install
+	mkdir build
+	cd build
+	cmake .. -DVTK_Group_MPI:BOOL=true -DBUILD_TESTING:BOOL=false -DCMAKE_INSTALL_PREFIX=../install
+	make -j
+	make install
+	cd ..
+	cd ..
+fi
+
+echo "Building VTK done!"