Allow a PUT to modify running VMs
Custom-set VM lifetimes override system-wide
Adding docs for PUT modifications

Also: cleaning up a little bit.
Merge pull request #22 from sschneid/configurable_host_lifetime

Configurable host lifetimes
Correctly log a VM's lifetime
Merge pull request #23 from sschneid/configurable_host_lifetime

Correctly log a VM's lifetime