Documentation Update.

A collection of smaller changes to the documentation as well as adding modelines to all vim files so code stays correctly indented.

Changes:
* Add modelines to all code/doc files excluding README.md.  The modeline used is: `" vim: set expandtab sts=2 ts=2 sw=2 tw=78 norl:` So code patches stay consistent. @jdevera noted this might help on a previous commit.
* Rename links with /vundle to /Vundle.vim, seems to confuse some people with redirect.
* Remove duplicates from Quickstart, add example of `name` flag.
* Changed quickstart to demonstrate begin/end.
* Add link to Tips page by @Lucc .
* Change help maintain vundle link directly to the new one.

Note: We will need to reclone/mv to Vundle.vim instead of vundle to continue using the test files. Existing users that don't need to run these can stay on vundle as long as they want.

This doc update brings the next branch up to date. After we deal with #425 & #435, we should cut a release from next -> master.  I don't think there's anything terribly objectionable in this change set but I leave it up for comment/review. Any issues @jdevera.