1.9 compat: let -g option work with Ruby 1.9

[#3105 state:committed milestone:2.3.5]

Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>

railties/lib/rails_generator/options.rb

@@ -137,10 +137,10 @@ def add_general_options!(opt)
             end
           end
           opt.on('-g', '--git', 'Modify files with git. (Note: git must be in path)') do
-            options[:git] = `git status`.inject({:new => {}, :modified => {}}) do |opt, e|
-              opt[:new][e.chomp[14..-1]] = true if e =~ /new file:/
-              opt[:modified][e.chomp[14..-1]] = true if e =~ /modified:/
-              opt
+            options[:git] = {:new => {}, :modified => {}}
+            `git status`.each_line do |line|
+              options[:git][:new][line.chomp[14..-1]] = true if line =~ /new file:/
+              options[:git][:modified][line.chomp[14..-1]] = true if line =~ /modified:/
             end
           end
         end