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.

Should fix #231.

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

Helptags seems to fail if some of the path components it receives are
symlinks. So resolve the symlink when calling helptags.

In Windows, some users set the Cygwin shell as their Vim shell, make
Vundle consider this when deciding which flavour of commands to run when
cloning. Roughly check if the shell contains `sh` in it, and assume a
Unix shell, even when on Windows.

Failures in :helptags commands for individual bundles were logged but
the error were not propagated to the installer.

Warn the user when a leading or trailing space is found in one the
bundle specs they have configured using the Bundle command.

The wildignore setting affects the behaviour of the `= shorthand, so
this changeset replaces the last remaining use of such construct with a
call to exec.

Certain wildignore values prevented the various logs from being
viewable.

Fixes #249

inspired by
https://github.com/gmarik/vundle/pull/228 and
https://github.com/gmarik/vundle/pull/172

Vim patch #445 changed shell escaping and introduced incompatabilities for vundle.
Now vundle only escapes joined commands with double quotes on windows when shellxquote is not set to '('.
This workaround closes https://github.com/gmarik/vundle/issues/146 - the mentioned workaround
is no longer needed, but it does not break a vim configurations which contains "set shellxquote=".

DRY shell escaping and modified (hopefully) all relevant places.

- causes #203

This reverts commit 1e140c9f6b.

- not all versions of vim 7.2 support the extra argument for glob*(),
  only those compiled with patch 51

- make it append only (instead both append + prepend)
- which draws *_rm_a and *_add_a useless as &rtp order gets preserved
- benefits: simpler, faster, less code

The codepath does not appear to have been tested; mv on Win32 is move,
and substitute has 4 arguments instead of 3.

When vundle installed as git submodule, git create file '.git' instead of
directory '.git'.

And vundle cannot update by self :(

With just `git clone`, submodules are not grabbed. This is an issue for
certain plugins, such as 'kevinw/pyflakes-vim' that requires a pyflakes
submodule

- add /d switch to cd command to perform drive change
- enclose joined commands with quotes

Instead checking for specific text in the output of the git commands, determine
the status of the bundle by comparing the sha of HEAD before and after the
git pull command.

- as before Helptags returned 'updated'

- addresses #162 issues

If no errors exist, the status-line will inform users how to view the
Changelog after BundleUpdate! is completed.

Instead of creating a vundle_update tag to compare changes between update
and HEAD we now use the output from `git pull` to get initial/updated shas.

Distinction between `new` and `updated` simplifies the process
of adding a bundle to the updated_bundle list.

If the Bundle is hosted on GitHub include link to compare the commit range
visually on GitHub.

Keeps track of the current commit with a vundle_update tag before
perfoming an update and adds all commits pulled in the update to a
Changelog accessible via pressing 'u' after BundleInstall! completes.

- also work in batches

- having it as a function makes it slower

- as `http` one just redirects to `https` on GitHub

- use `let g:vundle_default_git_proto = 'git'` to set default protocol
to build URIs to clone from

- "transcient bundle" - a bundle installed with :BundleInstall or interactively
  without being declared in .vimrc

- treat them the as if they were configured
- so everything works the same

- ie before this change helptags weren't generated automatically
  with `BundleInstall bundle` or with interactive mode

- it changes the way `:BundleClean` works, since it removes directories
  that aren't bundles
- FIX: `:source .vimrc` to let `:BundleClean` remove transcient bundles

- closes #99

- closes #64

- closes #104

- closes #110

Also save/restore input so potential mappings aren't broken.

Prevents the user from having to type a space before the search term.

- closes #80

- use `redraw` instead `redraw!`
- closes #90