docs(installing): fix up ReST syntax
docs(installing): add section on installing SSL

This section explains and describes how you can install an SSL certificate onto your load
balancer for SSL encryption between the client and the server, as well as the
applications themselves.

Note that this commit is dependent upon #1010 to be merged before SSL encryption works with Deis.
docs(ssl): add links for EC2/Rackspace ELBs
Merge pull request #1184 from deis/ssl-docs

docs(installing) add section on installing SSL