Move World function to helpers file

Because Cucumber's autoloading would cause issues otherwise.

Author: moertel

lib/squcumber-postgres/support/helpers.rb

@@ -0,0 +1,3 @@
+require_relative 'matchers'
+
+World(MatcherHelpers)

lib/squcumber-postgres/support/matchers.rb

@@ -142,7 +142,3 @@ def convert_mock_value(value)
     end
   end
 end
-
-if defined?(World)
-  World(MatcherHelpers)
-end

squcumber-postgres.gemspec

@@ -16,6 +16,7 @@ Gem::Specification.new do |s|
     'lib/squcumber-postgres/step_definitions/common_steps.rb',
     'lib/squcumber-postgres/support/database.rb',
     'lib/squcumber-postgres/support/matchers.rb',
+    'lib/squcumber-postgres/support/helpers.rb',
     'lib/squcumber-postgres/support/output.rb',
     'lib/squcumber-postgres/rake/task.rb'
   ]