Move all rspec config to spec_helper

Inspired by: https://stackoverflow.com/a/7364289

We can also read more about the config options over here:
https://relishapp.com/rspec/rspec-core/v/3-10/docs/configuration

.rspec

@@ -1,3 +1 @@
---color
---profile
 --require spec_helper

spec/spec_helper.rb

@@ -0,0 +1,17 @@
+RSpec.configure do |config|
+  # Use color in STDOUT
+  config.color = true
+  # Use color not only in STDOUT but also in pagers and files
+  config.tty = true
+
+  # Display 10 slowest tests after a test run
+  config.profile_examples = true
+
+  # Use the specified formatter
+  # :documentation, :progress, :html, :json, CustomFormatterClass
+  config.formatter = :progress
+
+  # Specify order for spec to be run in
+  # TODO: make sure all specs pass when set to :rand
+  # config.order = :rand
+end