Put heat functions in the stack users bash_profile
Run stack.sh with -i to get stacks environment

stack.sh relies on the stack user's environment, such as use of the
$HOME variable should point to /opt/stack instead of /root
Default devstack flavor to 4G

1/2G flavors don't have enough memory for devstack to complete
Merge pull request #18 from arbylee/devstack

Fix staging devstack template