Getting parallel_tests working on Win7

Fixes how number of running processes are retrieved

Adds a rspec_in_path? method that checks for handling of 'rspec' command without the need for adding a bin or script path

moves to using Process.spawn to handle problem of sub-processes that are started and detached blocking completion of the 'open' command so tests would not complete

*Edit* removed version change because Travis build didn't pick up version 0.16.11

updated rspec/runner_spec.rb tests to ensure handling of new rspec_in_path? method