Direct Drive Bowden Minimalist Extruder 2.0

This is a remix of my original found here: http://www.thingiverse.com/thing:239710. That one worked fine but I found that (as always) there were improvements that could be made.

Change log:
- I moved the bowden push fit connector to the back plane to increase range of movement for the lever without adding unneeded bend to the filament, so now there is a cleaner path of travel for the filament with less friction.
- I added a funnel to the top of the bowden connection area to ease filame