Launch current minitest case when its name contains spaces

[brilnius]

In a Minitest case, the action "Test Single" (ruby-test:test-single) does not work when the test-case name has spaces.
This is because:
test "my awesome feature" do
is equivalent to:
def test_my_awesome_feature

The triggered command is:
ruby -I test test/unit/contact_import_test.rb -n "/my awesome feature/"
But should be:
ruby -I test test/unit/contact_import_test.rb -n "/my_awesome_feature/"

This one-line patch simply replaces spaces with "_" on the fly, to make it work.
I'm not sure it will work for everybody, but hopefully some might find it useful.

[moxley]

@brilnius: I sent you an invite to be a collaborator to this project.