[BigV] Rename account_overview request to get_account_overview and add comments
[BigV] Add create_virtual_machine request
[BigV] Add create_server request
[BigV] Add update_virutal_machine request
[BigV] Add request for delete_virtual machine
[BigV] Add get_nics request
[BigV] Tweaks and addition of new requests to compute.rb
[BigV] Continue implementation of Server model
[BigV] Tweaks to Servers collection