Merge pull request #418 from hainesr/open-options

Add `options` parameter to `Zip::File.open`.

lib/zip/file.rb

@@ -104,11 +104,11 @@ def initialize(path_or_io, create = false, buffer = false, options = {})
     end
 
     class << self
-      # Same as #new. If a block is passed the ZipFile object is passed
-      # to the block and is automatically closed afterwards just as with
-      # ruby's builtin File.open method.
-      def open(file_name, create = false)
-        zf = ::Zip::File.new(file_name, create)
+      # Similar to ::new. If a block is passed the Zip::File object is passed
+      # to the block and is automatically closed afterwards, just as with
+      # ruby's builtin File::open method.
+      def open(file_name, create = false, options = {})
+        zf = ::Zip::File.new(file_name, create, false, options)
         return zf unless block_given?
         begin
           yield zf