TeX.gitignore modification for Emacs users (#2491)

* without . the auto directory is still considered for commits

* small addition that ensures all Emacs-Lisp files (.el files) are ignored

Author: cmower

TeX.gitignore

@@ -215,7 +215,8 @@ TSWLatexianTemp*
 *~[0-9]*
 
 # auto folder when using emacs and auctex
-/auto/*
+./auto/*
+*.el
 
 # expex forward references with \gathertags
 *-tags.tex