Add option to show browser's local time (#1653)

* Add tests for --local-time option
* Update Readme

test/test_local_time_option.rb

@@ -0,0 +1,66 @@
+# ~*~ encoding: utf-8 ~*~
+require File.expand_path(File.join(File.dirname(__FILE__), 'helper'))
+require 'nokogiri'
+require 'json'
+require 'time'
+
+def local_time
+  Precious::App.set(:wiki_options, { show_local_time: true})
+end
+
+def no_local_time
+  Precious::App.set(:wiki_options, { show_local_time: false})
+end
+
+def assert_time_tags(body)
+  tags = Nokogiri::HTML(body).css('time')
+  assert_equal tags.empty?, false
+  tags.each do |tag|
+    assert Time.parse(tag[:datetime]).utc?
+  end
+end
+
+context ":show_local_time option" do
+  include Rack::Test::Methods
+  
+  setup do
+    @path = cloned_testpath('examples/lotr.git')
+    @wiki = Gollum::Wiki.new(@path)
+    Precious::App.set(:gollum_path, @path)
+    local_time()
+  end
+
+  teardown do
+    FileUtils.rm_rf(@path)
+  end
+
+  test "last_commit_info no local time" do
+    no_local_time()
+    get '/gollum/last_commit_info', {path: 'Home.textile'}
+    assert_equal Time.parse(JSON.parse(last_response.body)['date']).utc?, false
+  end
+  
+  test "last_commit_info local time" do
+    local_time()
+    get '/gollum/last_commit_info', {path: 'Home.textile'}
+    assert Time.parse(JSON.parse(last_response.body)['date']).utc?
+  end
+  
+  test "datetime attributes in utc" do
+    get '/Home/b0d108328459e44fff4a76cd19b10ddc34adce4b'
+    assert_time_tags last_response.body
+    
+    get '/gollum/latest_changes'
+    assert_time_tags last_response.body
+    
+    get '/gollum/history/Home'
+    assert_time_tags last_response.body
+    
+    get '/gollum/commit/b0d108328459e44fff4a76cd19b10ddc34adce4b'
+    assert_time_tags last_response.body
+  end
+
+  def app
+    Precious::App
+  end
+end