Added the ability to send files if vmware tools are installed

Third attempt at a pull request :)

- vsphere_guest:
    vcenter_hostname: vcenter.mydomain.local
    username: myuser
    password: mypass
    guest: newvm001
    send: yes
    src_file: /path/to/local/file
    dst_file: /path/on/guest
    overwrite: no
    guest_user: guestadmin
    guest_passwd: supersecret


It was mentioned that an example of how it works would be nice, I am not really sure how you mean. I've included updated documentation in my commit to demonstrate usage.