try ctrlp_root_markers before looks up to root

fixes #333

Author: mattn

autoload/ctrlp.vim

@@ -1763,6 +1763,7 @@ fu! ctrlp#setpathmode(pmode, ...)
 		let spath = a:0 ? a:1 : s:crfpath
 		let markers = ['.git', '.hg', '.svn', '.bzr', '_darcs']
 		if type(s:rmarkers) == 3 && !empty(s:rmarkers)
+			if s:findroot(spath, s:rmarkers, 0, 0) != [] | retu 1 | en
 			cal filter(markers, 'index(s:rmarkers, v:val) < 0')
 			let markers = s:rmarkers + markers
 		en