Remove coupling with Bundler

Bundler is not required to use this library and explicitly requiring and
calling `Bundle.setup` or `Bundle.require` is discouraged. This commit
removes much of the code that tightly couples rspec-system-puppet with
bundler and updates the documentation to reflect this.
Merge pull request #10 from hunner/bundle_exec

Remove coupling with Bundler
Add module_path option to puppet_apply helper
- Pass node option when creating the host alias for puppet.
- Fixes #13
Merge pull request #12 from domcleal/apply-module-path

Add module_path option to puppet_apply helper
Merge pull request #14 from treydock/fix_puppet_install_multinode

Pass node option when creating the host alias for puppet.
Release 2.1.0

Signed-off-by: Ken Barber <ken@bob.sh>
Merge branch 'release_210'

* release_210:
  Release 2.1.0
Add puppet option to facter helper
Merge pull request #16 from treydock/expand_facter_helper

Add puppet option to facter helper
Release 2.2.0

Signed-off-by: Ken Barber <ken@bob.sh>
Merge branch 'release_220'

* release_220:
  Release 2.2.0
Update puppetlabs-release RPM version.
Merge pull request #21 from stefanozanella/update_puppetlabs_release_rpm

Update puppetlabs-release RPM version.