Add 'shared_context' keyword

Author: uasi

autoload/rails.vim

@@ -3647,7 +3647,7 @@ function! s:BufSyntax()
           syn keyword rubyRailsTestControllerMethod assert_response assert_redirected_to assert_template assert_recognizes assert_generates assert_routing assert_dom_equal assert_dom_not_equal assert_select assert_select_rjs assert_select_encoded assert_select_email assert_tag assert_no_tag
         endif
       elseif buffer.type_name('spec')
-        syn keyword rubyRailsTestMethod describe context it its specify shared_examples_for it_should_behave_like before after around subject fixtures controller_name helper_name scenario feature background
+        syn keyword rubyRailsTestMethod describe context it its specify shared_context shared_examples_for it_should_behave_like before after around subject fixtures controller_name helper_name scenario feature background
         syn match rubyRailsTestMethod '\<let\>!\='
         syn keyword rubyRailsTestMethod violated pending expect double mock mock_model stub_model
         syn match rubyRailsTestMethod '\.\@<!\<stub\>!\@!'