Fix project snippets button appearing when it is disabled

Closes #1705

app/models/ability.rb

@@ -115,7 +115,7 @@ class Ability
         end
 
         unless project.snippets_enabled
-          rules -= named_abilities('snippet')
+          rules -= named_abilities('project_snippet')
         end
 
         unless project.wiki_enabled

features/project/project.feature

@@ -68,3 +68,8 @@ Feature: Project
     When I visit project "Shop" page
     Then I should not see "New Issue" button
     And I should not see "New Merge Request" button
+
+  Scenario: I should not see Project snippets
+    Given I disable snippets in project
+    When I visit project "Shop" page
+    Then I should not see "Snippets" button

features/steps/project/project.rb

@@ -110,4 +110,8 @@ class Spinach::Features::Project < Spinach::FeatureSteps
   step 'I should not see "New Merge Request" button' do
     page.should_not have_link 'New Merge Request'
   end
+
+  step 'I should not see "Snippets" button' do
+    page.should_not have_link 'Snippets'
+  end
 end

features/steps/shared/project.rb

@@ -14,6 +14,11 @@ module SharedProject
     @project.team << [@user, :master]
   end
 
+  step 'I disable snippets in project' do
+    @project.snippets_enabled = false
+    @project.save
+  end
+
   step 'I disable issues and merge requests in project' do
     @project.issues_enabled = false
     @project.merge_requests_enabled = false