Resolve view paths correctly on CygWin

Signed-off-by: NMikel Lindsaar <raasdnil@gmail.com>

actionpack/lib/action_view/template/resolver.rb

@@ -104,7 +104,7 @@ def build_path(name, details, prefix, partial)
     end
 
     def query(path, exts)
-      query = "#{@path}/#{path}"
+      query = File.join(@path, path)
       exts.each do |ext|
         query << '{' << ext.map {|e| e && ".#{e}" }.join(',') << '}'
       end