Fixed group tests

features/steps/admin/groups.rb

@@ -105,7 +105,7 @@ class Spinach::Features::AdminGroups < Spinach::FeatureSteps
       select "Developer", from: "access_level"
     end
 
-    click_button "Add users to group"
+    click_button "Add to group"
   end
 
   step 'I should see current user as "Developer"' do

features/steps/group/members.rb

@@ -109,7 +109,7 @@ class Spinach::Features::GroupMembers < Spinach::FeatureSteps
   step 'I search for \'Mary\' member' do
     page.within '.member-search-form' do
       fill_in 'search', with: 'Mary'
-      click_button 'Search'
+      find('.member-search-btn').click
     end
   end