Servo Bracket w/ X-Endstop Holder

This is a servo bracket for auto bed leveling, designed specifically for the Folger Tech Prusa i3. I made some minor modifications to MindRealm's great design to better suit my needs. It now integrates an X-endstop mount in addition to the original features. Also, a modified servo arm that should be more compatible with different servos, and a variant that places the Z probe switch on the opposite side of the arm (needed when the arm interferes with the X switch). Finally, the top piece of the b