Allow more powerful grepping in Base grep method.

Signed-off-by: Scott Chacon <schacon@gmail.com>

Author: kenpratt

lib/git/base.rb

@@ -239,8 +239,8 @@ def lib
     #       puts "\t line #{match[0]}: '#{match[1]}'"
     #     end
     #   end
-    def grep(string)
-      self.object('HEAD').grep(string)
+    def grep(string, path_limiter = nil, opts = {})
+      self.object('HEAD').grep(string, path_limiter, opts)
     end
 
     # returns a Git::Diff object