(PE-5677) Add tests for gem cli tool.

Signed-off-by: Wayne <wayne@puppetlabs.com>
Merge pull request #234 from waynr/stable/maint

(PE-5677) Add tests for gem cli tool.
(SERVER-104) Added docs for ext. SSL termination
(SERVER-104) Updated spelling/grammar and wording
(SERVER-104) Updated link
(SERVER-104) Clarification
(SERVER-104) Further clarification
Merge pull request #242 from dankreek/SERVER-104/document-certs-in-x-headers

(SERVER-104) Added docs for external SSL termination
DOC-1281: Revised README for Puppet Server

Reorganized and edited the Puppet Server readme.
DOC-1281 Edits to revised Puppet Server README

Some edits based on Nick's review of the doc.