added .gitignore file

- Created .gitignore file within the template directory. I believe
  that /this/ repository should not know about them but the
  new_beamer_presentation should export these so that we don't have to
  create a new .gitignore file from scratch every time we create a
  presentation.

slides_template/.gitignore

@@ -1 +1,10 @@
-auto/*
+auto/
+/*.aux
+/*.log
+/*.nav
+/*.out
+/*.pdf
+/*.snm
+/*.toc
+/notes.config
+/vc