New info on user roles, swauth tools and authentication

Adding new information to the authentication guide on how user
roles are defined in gswauth. Also provided information on all
gswauth tools and how to authenticate as a user.

Change-Id: If565f4bfa9d112cdf7778f930cb4f75ee670d6c4
Signed-off-by: Thiago da Silva <thiago@redhat.com>
Reviewed-on: http://review.gluster.org/6494
Reviewed-by: Luis Pabon <lpabon@redhat.com>
Tested-by: Luis Pabon <lpabon@redhat.com>
Signed-off-by: Thiago da Silva <thiago@redhat.com>
Reviewed-on: http://review.gluster.org/6555
Reviewed-by: Prashanth Pai <ppai@redhat.com>
updading quick start guide with Havana information

Updatd links to point to havana builds as well as wording
Changed 'Gluster for Swift' to 'Gluster-Swift'

Change-Id: I60df2c6c1a6bb0dac529ac50f552fa262fb9ff23
Signed-off-by: Thiago da Silva <thiago@redhat.com>
Signed-off-by: Luis Pabon <lpabon@redhat.com>
Reviewed-on: http://review.gluster.org/6297
Reviewed-on: http://review.gluster.org/6554