add g:ctrlp_custom_tag_files

close #282

Author: mattn

autoload/ctrlp/tag.vim

@@ -137,8 +137,8 @@ fu! ctrlp#tag#id()
 endf
 
 fu! ctrlp#tag#enter()
-	let tfs = tagfiles()
-	let s:tagfiles = tfs != [] ? filter(map(tfs, 'fnamemodify(v:val, ":p")'),
+	let tfs = get(g:, 'ctrlp_custom_tag_files', tagfiles())
+	let s:tagfiles = type(tfs) == 3 && tfs != [] ? filter(map(tfs, 'fnamemodify(v:val, ":p")'),
 		\ 'filereadable(v:val)') : []
 endf
 "}}}

doc/ctrlp.txt

@@ -1498,6 +1498,9 @@ Special thanks:~
 ===============================================================================
 CHANGELOG                                                     *ctrlp-changelog*
 
+    * New option |g:ctrlp_custom_tag_files| to specify custom tag files.
+    * Accept 0 for g:ctrlp_match_window no-limited window size.
+
 Before 2016/11/28~
 
     + New command: |YankLine()| to yank current line.