Removed packages, services class. Added ssh class.

Put default packages into init.pp. Used whole class
for ssh. Removed packages and services classes because
they are vague and repetitive.
init.pp now creates users based on the users param

If class is called specifing the users param as either a string,
an array, or a hash, users will be created.

If users are specified as a string or array they are simply
created.

If users are specified as a hash, they are created with params
from the hash.

If no users are specified, no users are created.