Remove production warning from README
Update reference to minimum puppet version to 3.7.3
(MAINT) Update puppet version references to 3.7.3
Merge pull request #263 from waynr/maint

(MAINT) Update puppet version references to 3.7.3
(SERVER-120) Update version to 0.4.0 for release
(SERVER-120) Update CHANGELOG for 0.4.0 release notes

Contains changelog updates for the release summary.
Merge pull request #266 from nwolfe/svr120-release-notes

(SERVER-120) Update CHANGELOG for 0.4.0 release notes
Merge pull request #265 from nwolfe/svr120-update-version-number

(SERVER-120) Update version to 0.4.0 for release
(SERVER-120) Bump version to SNAPSHOT
Merge pull request #267 from nwolfe/svr120-snapshot-version

(SERVER-120) Bump version to SNAPSHOT
DOC-1281 Revised Puppet Server configuration.markdown

Revision + edits.
Squashed commits.
DOC-1289: Puppet Server known_issues page

A few small edits... nothing major here.
DOC-1281 Edited Puppet Server install_from_packages page

Revised the Puppet Server Install from Packages page.
DOC-1281: Puppet Server install_from_packages page

A few more edits.
DOC-1281: Puppet Server install_from_packages
(SERVER-112) Clean up puppet server ruby config

Prior to this commit, we were passing in the optional profiler
object from the Clojure code to the Ruby code as a first-class
argument to the constructor of our Ruby `Master` class.

It's becoming clear that we're going to have more of these
Puppet-Server-specific config options that we have to pass through
over time (including some things that will be coming soon in order
to complete SERVER-112), so this commit refactors the code to
pass in a map containing *all* Puppet Server settings as a single
argument.

It also makes an initial effort to start moving the handling of
some of those settings into the Puppet::Server::Config class,
and tries to group them together a bit more inside the body
of the `Master` constructor.
(SERVER-112) Refactor ruby settings initialization

This commit just introduces some new methods to help take care
of Ruby settings initialization, in preparation for cleaning
up `master.rb` a bit.
(SERVER-112) Move puppet/puppetserver ruby config out of `master.rb`

`master.rb` was getting pretty hairy.  This commit moves the code
related to initializing Puppet Server's ruby stuff into the
Puppet::Server::Config class, and introduces a new class
Puppet::Server::PuppetConfig to house the Puppet ruby initialization.
(SERVER-112) Move `execution` code into its own class

The `Execution` stuff seemed out of place in `master.rb` and
`config.rb`, so this moves it to its own spot.
(SERVER-112) Move request handler logic to module

There was a lot of logic related to the Puppet::Network::HTTP::Handler
module that was inlined in `master.rb`.  This commit simply moves
it into its own module that we can mix in instead of mixing in
the one from Puppet directly.