i3v anti z wobble and backlash mount Remix for easier printing & variable configurations

This is a Remix of http://www.thingiverse.com/thing:769057 modification which was a remix of Scratchhax's Thing at http://www.thingiverse.com/thing:766440
This remix does the following.
1. to make it printable without support (used 45 degree incline)
2. Made it 1mm wider for nut hole vertex not hitting inside edge
3. Parametric openscad file to vary dimensions for Spring & T-nut mounting height
4. You can also print this without the spring to just give you more x travel distance