Allow rtp paths with spaces on Windows

Fixes #451
Fixes #453

Suggested by @ikurcubic

Fixes #443

* Fixes 435

So it can be reused.

Fixes #441

If one had this plugin:

Plugin 'foo/bar'

And now switches to another one with the same name:

Plugin 'baz/bar'

Recognise this scenario and replace the old plugin with the new one,
rather than silently assuming they are the same.

Fixes #367 #48 #183 #400

* 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:`
* Rename links with /vundle to /Vundle.vim, seems to confuse some people with redirect.
* Remove duplicates from Quickstart, add example of `name` flag.
* Add link to Tips page by @Lucc .
* Change help maintain vundle link directly to the new one.
* README.md line number links updated.

Note: Users with bundle/vundle need to rename vundle to Vundle.vim to use test files. Vundle will continue to function otherwise.

Fixes #413.
Fixes #438.

It's a duplicate of the PluginSearch command.

Fixes #428

- Complete the code documentation effort started by @lucc
- Remove some judgemental comments ✨
- Remove comments pertaining to things that should be opened as issues
- Boxed ❗

Also add some FIXME markers in places where the code needs more
explanation.

New supported option called 'pinned' for the Plugin command. When set to
1, the plugin is added to rtp but no install/upgrade operation is
performed.

It not only allows vundle to do rtp management of plugins on VCS other
than git, it also allows leaving plugins that had previously been
managed by vundle in the current state, with no further updates.

Fixes #24, #397

Prevents error 150 when user has doc/* in wildignore

Fixes #112

Use correct filesystem url in README

change from `Plugin 'file///path/from/root/to/plugin'` to `Plugin 'file:///path/from/root/to/plugin'`

Fix incorrectly aliased VundleInstall command

Readability improvement for the vim commands.

Still keep :Bundle backwards compatible.

- closes many issues )

Interactive mode restored. Fixes issue #407.

Allows Bundle plugin folder renaming.

Bundle configuration options that are inferred from the bundle specs
overwrite user provided ones. This used to prevent users from changing
the name of directory where the cloned bundle should go, for instance.

Keep the user provided options with a preference over inferred ones.

Use the global bundles instead of reinitializing

Should fix #231.

Vimdoc Update Based On New Readme

vundle.txt update: explain directory argument to :Bundle & fix Vundle path

Add some documentation to explain the directory argument (optional second
argument) to the Bundle command.  Maybe fixes #295

- resolve introduced in 08e9894d2 resolves only bundle dir
- so '/doc/' dir doesn't loose its trailing slash

Add A CONTRIBUTING.md file to root.

Merging in new updated README. Wiki changes will be updated as well.

Some documentation fixes and changes to the VimDocs.