Add tests for windows and remove usage of OPENSSL to check MD5 as keytool has that capability

Conflicts:
	spec/acceptance/keystore_spec.rb
	spec/acceptance/private_key_spec.rb
	spec/acceptance/truststore_spec.rb
	spec/spec_helper_acceptance.rb
This should be moved into the spec_helper_acceptance.rb and the value for the source attribute found in the ENV.