Fix #374 shellescape problem

[Shougo]

I fixed shellescape problem and tests.
I tested it, but it is not under Windows. Can you test this fix before including?

[starcraftman]

Hi @Shougo, I have Windows so I can test this. I'm not super familiar with GitHub's work flow. Is there an easy way I can get a simple patch file to apply with git to vundle? Do I need to be a collaborator?

I'll mention @gmarik in case he wants to answer.

[gmarik]

@starcraftman just add .patch to the url

Thanks for checking it out!

[starcraftman]

@gmarik Thanks. That's pretty easy. I'll try it after lunch.

[starcraftman]

@Shougo @gmarik

I just tested this on Windows 7 64bit with Vim. Works as expected. Without the patch and with shellslash set I get an error. With the patch applied to the latest vundle it works as expected.

Only warning I got is that there is a trailing whitespace on line 96 of the patch, otherwise works as advertised.

[gmarik]

Tested on OSX no issues found…
Merged in 4472ffa
Thank you!

[Shougo]

Thank you!