Add syntax files from upstream vim repository

indent/bib.vim

@@ -0,0 +1,19 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" Vim indent file
+" Language:      BibTeX
+" Maintainer:    Dorai Sitaram <ds26@gte.com>
+" URL:		 http://www.ccs.neu.edu/~dorai/vimplugins/vimplugins.html
+" Last Change:   2005 Mar 28
+
+" Only do this when not done yet for this buffer
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
+setlocal cindent
+
+let b:undo_indent = "setl cin<"
+
+endif