(SERVER-138) Created puppet.conf differences doc

This commit introduces a new document which contains some information
about the differences in supported settings from the `puppet.conf` file
for Puppet Server as opposed to the Ruby-based Puppet master.
(SERVER-138) Addressed PR feedback

This commit addresses some PR feedback, including:

* Reworded the language in the `ca` setting
* Added a note to the `configtimeout` setting about how Puppet agents
  still honor the setting
(MAINT) Make user repl config dynamic

This commit modifies `user_repl.clj` and the sample `user.clj`
file to use a function instead of a var for the user-provided
config.

Prior to this, the config was read from disk as a var when the
REPL was first launched, and never re-loaded after that.  This
meant that doing a `reset` would not pick up changes you might
have made to the config files on disk; you needed to restart
the REPL to pick up those changes.

Now, the user config is acquired via a function call, which
means that your config files will be reloaded each time you
call `reset`.
(SERVER-151) Move environment fns from jruby-testutils to service

We originally defined some functions for interacting with the
environment cache state in jruby-testutils.  This commit moves
the logic into the `JRubyPuppetService` instead; this will be necessary
in order to wire up the HTTP endpoint, since we will only have
access to the service and not to the entire TK app.
(MAINT) Fix bugs in webrouting config

There were a few minor issues with the default config I provided
for the webrouting service.  This commit should fix them.
(MAINT) rename jvm-puppet-conf to puppet-server-conf
Merge pull request #278 from cprice404/maint/master/fix-webrouting-bugs

(MAINT) Fix bugs in webrouting config
Merge pull request #276 from cprice404/maint/master/dynamic-user-config

(MAINT) Make user repl config dynamic
Merge pull request #277 from cprice404/feature/master/SERVER-151-flush-env-cache-from-service

(SERVER-151) Move environment fns from jruby-testutils to service
(SERVER-138) Set name of doc section to HttpPool-Related Server Settings

This commit changes the name of the last section in the new
`puppet_conf_setting_diffs.markdown` doc to `HttpPool-Related Server
Settings`.
(SERVER-113) Refactor whitelist logic out to ringutils

We are going to use the same whitelist logic for the new admin
endpoint that we were using for the cert-status endpoint.  This
commit refactors the logic out to the common ringutils namespace
so that we can access it from the new code.
(SERVER-167) Add documentation on `set_trace_func`

This commit adds some documentation on the use of the Ruby
`set_trace_func` function in the JRuby environment to trace events in
Ruby code when running in Puppet Server.
(SERVER-113) Add new puppet-admin-api HTTP endpoint

This commit adds a new TK service and HTTP endpoint for puppet
admin functionality.  For now, it just has a placeholder
"/hello" route, but the scaffolding is in place for wiring
in the real functionality, including:

* Support for client whitelist configuration
* Versioned routes (just /v1 for now)
(SERVER-203) Update to clj-http-client 0.4.0

This commit updates Puppet Server to utilize puppetlabs/clj-http-client
version 0.4.0.
Merge pull request #282 from camlow325/maint/master/SERVER-203-update-to-clj-http-client-0-4-0

(SERVER-203) Update to clj-http-client 0.4.0
Just fixing a spelling mistake
Merge pull request #286 from inhumantsar/patch-1

Just fixing a spelling mistake
Merge pull request #280 from cprice404/feature/master/SERVER-113-admin-http-endpoint

(SERVER-113) admin http endpoint
(SERVER-138) Fixed typo

This commit fixes one minor typo found during a PR review.
Merge pull request #272 from camlow325/maint/master/SERVER-138-puppet-conf-setting-diffs-doc

(SERVER-138) Created puppet.conf differences doc