Remove duplicated inclusion of `rspec-system-puppet` helpers.

The helpers are already included a couple of lines above the deleted line, and
including them inside the `RSpec.configure` block argument would have no effect
anyway.
Provide ability to test against rspec-system git or file based paths

Signed-off-by: Ken Barber <ken@bob.sh>
Added option to skip files when copying modules
and skip .rspec_system by default
execute must return a result
Added documentation for :skip option
Merge pull request #26 from tbartelmess/master

Added option to skip files when copying modules
Merge pull request #24 from kbarber/test_against_rspec_system_master

Provide ability to test against rspec-system git or file based paths
Merge pull request #19 from stefanozanella/update_docs

Remove duplicated inclusion of `rspec-system-puppet` helpers.