Merge remote branch 'upstream/master'

* upstream/master:
  added Waf.gitignore
  Don't ignore empty files meant to preserve the file structure of an application within a git repository for later deployment
  Ignore files generated by Etags and Ctags
  Performance Sessions & Reports.
  Visual C++ additions.
  Added ignore patterns for projects generated using seam-gen
  add Coq gitignore
  dont track compiled elisp
  Added a VB.Net gitignore
  Added to Drupal.gitignore
  add "*.tmproject" to ignore list
  Added patterns for LaTeX Beamer
  Add in rules for WP Super Cache, Google XML Sitemaps, and WP-DBManager plugins.
  Add OCaml gitignore
  Add CVS gitignore for anyone who has to code-share with projects using CVS. Save the dinosaurs.
  Add SVN gitignore for anyone who has to code-share with projects using Subversion
  Fix typo in CodeIgniter gitignore
  Added Drupal gitignore.