Update points parser for VTK Loader

Some vtk files don't have float numbers in POINTS section.
They are int numbers. For example, parse wants:
0.0 1.5 2.0
But came:
0 1.5 2
This fix remove part after "." in number, and parse will work.
In previos implementation pattern search nothing.
I would like to have more for VTK in Three.js