Handle the full path relative to appliance

To patch the existing firmware update and leave backwards compatability,
added a new optional paramater "copy_to_tftp" if this is set to true
It will copy the binaries from the nfs share to the tftp share and set a new url variable
Change copy_to_tftp to array

changed the input paramater to an array that takes the source and destination values
for the binaries.  defaults to nil and doesn't do anything
Don't set tftp owner

Don't hardcode the owner of the tftp file
Merge pull request #25 from logankimmel/copy_to_tftp

Handle the full path relative to appliance