Add ability to install rbenv independently

- Can now install rbenv separately. Can be used as a requirement in a
  state for installing rbenv plugins using the git or file states
Fix description of method and whitespace lost
only use token_file if modified within token_expire time
use time.mktime, not time.strftime
implement serializers
expose documentation of serializers
implement aggregation
ensure that str are yaml friendly
document aggregation
added reset tag
a little bit of lint
Fire the event's data, not the entire _minion_event command
Move nova.py module to salt/utils/openstack/
hook nova module to salt/utils/openstack/nova.py
Fix docstring on set_date
Add account expire support through chage
Merge remote-tracking branch 'upstream/develop' into shadow-module-updates
add to setup.py
added versionchanged
I forgot how to python