don't modify path names in cached wiki treemaps

lib/gollum/file.rb

@@ -49,7 +49,7 @@ module Gollum
       checked = name.downcase
       map     = @wiki.tree_map_for(version)
       sha     = @wiki.ref_map[version] || version
-      if pair = map.detect { |(path, _)| path == checked }
+      if pair = map.detect { |(path, _)| path.downcase == checked }
         @path    = name
         @blob    = Grit::Blob.create(@wiki.repo,   :id => pair.last, :name => ::File.basename(@path))
         @version = Grit::Commit.create(@wiki.repo, :id => sha)

lib/gollum/wiki.rb

@@ -418,7 +418,6 @@ module Gollum
         path.gsub!(/\\\d{3}/)   { |m| m[1..-1].to_i(8).chr }
       end
       path.gsub!(/\\[rn"\\]/) { |m| eval(%("#{m.to_s}")) }
-      path.downcase!
       path
     end
 

test/test_wiki.rb

@@ -59,14 +59,14 @@ context "Wiki" do
     assert @wiki.tree_map.empty?
     @wiki.tree_map_for 'master'
     assert_equal({"master"=>"60f12f4254f58801b9ee7db7bca5fa8aeefaa56b"}, @wiki.ref_map)
-    assert_equal 'bilbo-baggins.md', @wiki.tree_map['60f12f4254f58801b9ee7db7bca5fa8aeefaa56b'][0][0]
+    assert_equal 'Bilbo-Baggins.md', @wiki.tree_map['60f12f4254f58801b9ee7db7bca5fa8aeefaa56b'][0][0]
   end
 
   test "#tree_map_for only caches tree for commit" do
     assert @wiki.tree_map.empty?
     @wiki.tree_map_for '60f12f4254f58801b9ee7db7bca5fa8aeefaa56b'
     assert @wiki.ref_map.empty?
-    assert_equal 'bilbo-baggins.md', @wiki.tree_map['60f12f4254f58801b9ee7db7bca5fa8aeefaa56b'][0][0]
+    assert_equal 'Bilbo-Baggins.md', @wiki.tree_map['60f12f4254f58801b9ee7db7bca5fa8aeefaa56b'][0][0]
   end
 end