add list nodes by ids to virtualbox
add list nodes by ids to fgcp
add list nodes by ids to joyent-cloudapi
add list nodes by ids to google-compute-engine
add list nodes by ids to abiquo
Merge pull request #45 from jclouds/virtualbox-listnodes

add list nodes by ids to virtualbox, fgcp, joyentcloud-api, gce, abiquo