Update versions
Use JRift 0.4.1.2, latest repo
Merge branch 'port_to_1_7_10' of https://github.com/mabrowning/minecrift into port_to_1_7_10

Conflicts:
	JRift
	build.py
Add client.md5 for first compile
Updated for preview2
Add minecrift version - pre2 release
Support pos track on/off (mainly for debug purposes currently)