Update global gitignore

* Remove .cap_tasks and .rake_tasks cache files (no longer used).
* Remove .rbenv-version and .rvmrc (deprecated in favor of .ruby-version).
* Improve matching of Vim swap files using a single RegExp.
* Ignore Thumbs.db (Windows thumbnail cache).
Remove NERDTreeToggle maps

NERDTree was removed in 1ef7a31f95ceedf01087540686db98280d0c1a38.
Update Vim bundles