ziptied X-end

UPDATE :
There was a big fail on the x-end-motor I corrected + increased space for GT2 belt


This is a slight remix of [Xoan's i3 ziptiedish x-end](http://www.thingiverse.com/thing:94867) and Josef prusa's vanilla prusa where :
- even the LM8UU are ziptied ! (2.5mm zipties work fine for this)
- added a 10 mm hole for the Z-axis to move freely as I'm rather using [my thing 1147671](http://www.thingiverse.com/thing:1147671) for leadscrew anti-wooble purposes.
- added a little hole on the x-end-motor for a M3 screw that will trigger the Z-endstop

So far I did print them but I haven't tested them as X-axis structural parts. There may be an issue with the room for the GT2 belt to move freely

The source are on my github fork of Xoan/Josef Prusa : https://github.com/Gad/Prusa3-vanilla. Feel free :)