set RSpec default in .rspec instead of spec_helper.

This way they can be overridden at the command line, e.g.: 'rspec -f progress'

Author: george-carlin

.rspec

@@ -0,0 +1,2 @@
+--color
+-f d

spec/spec_helper.rb

@@ -6,8 +6,4 @@
 Combustion.initialize!
 
 RSpec.configure do |config|
-  # Enable colors
-  config.color = true
-  # Use the specified formatter
-  config.formatter = :documentation
 end