Merge pull request #450 from jrogelstad/master

Add instructions to get latest tag
Update UBUNTU_SETUP.md
Update README.md

64 bit requirement warning
Update UBUNTU_SETUP.md

64 bit is required.
Update README.md

Tweak
Update UBUNTU_SETUP.md

Add notes on how to run JSHint
Merge branch 'xtuple' into 19797