Add the commands to install OSX.
(QENG-608) Check_for_package method should not use which command

- properly differentiate between packages and commands
- check_for_package updated to check for the given package name using
  the correct package manager per OS
- added check_for_command, which uses 'which' to determine if a command
  is currently available
- added spec test coverage for check_for_package
Add extendable rake task to have define on projects utilizing beaker
Refactor to have a single maintainable file for test tasks and require the rake task object
Remove assumption of delivery.puppetlabs.net
Remove the host tasks until we can fully bake what the use case is
fix yard docs
fixup merge conflicts
Get OSX installation working for realz

Previously we were using the passed in version for the versions of puppet
and its dependencies. This adds :facter_version and a :hiera_version keys
so that we can install those dependencies explicitly on platforms that we
must. It also adds the `-pkg` opt to the installer command to work on
newer OSXs.

Signed-off-by: Justin Stoller <justin@puppetlabs.com>
Provide default gem installation

This allows the `install_puppet` command to accept an additional parameter
`:default_action` which, if set to 'gem_install' will attempt to install
puppet from gem if it cannot otherwise install puppet. The default for
:default_action is still to fail hard.
Use specified versions if possible

Previously we allowed passing :version, :facter_version, and/or
:hiera_version to `install_puppet` but only respected `:version` with
windows and osx, and the others only on osx. This will attempt to
install the versions specified for any package specified. The version
information is still optional on linux machines, and there is no way for
us to respect the dependency versions on windows (since our windows
package is an omnibus package).
update documentation
This fixes small bugs within the install_puppet method
Fixup windows support for FOSS

Previously the PATH for windows was only being set to include executables
from git repos, not executables installed from native packages. This
includes the default installation path for native windows packages in the
FOSS command creation.
(QENG-758) add ability to select a group a beaker hosts based upon...

...a set of properties

- a shortcut means of selecting a sub group of hosts to run commands on
(QENG-597) 'master' DSL helper can return a non-master node...

...when actual master is confined away

- change around the logic so that the default node is defined at options
  parsing, not during test runtime
- determine the default node by it either being
  1.  the node with the role defined  as 'default'
  2.  the master node
  3.  the only node
  Then add the role 'default' to that node, if necessary
- differentiate between master and default, no longer allow the default
  to be used as a master if the master is undefined (keep roles clear,
  the master should only be the node defined as master)
Merge pull request #224 from anodelman/fix-default

(QENG-597) 'master' DSL helper can return a non-master node...
Fixed issue with default behavior not picking up type and hosts from rake task
fixup test
add tests for new install_puppet functionality