add options.cwd to set current working directory for command

[dluxemburg]

Adds the ability to set current working directory for command, handled the same was as Node's child_process. Test included.

[dluxemburg]

I left it as null because that's what the Node docs indicated the default was for child_process, so I figured that's what would make the fewest assumptions on top of the underlying implementation. I can change it to . in the pull request if you'd prefer.

[sun-zheng-an]

I prefer ., because I don't want to leak to implementation details that gulp-shell is built on top of child_process.exec().

[sun-zheng-an]

process.cwd() may be a better choice, what do you think?

[dluxemburg]

I'm not certain how they'd behave differently. It seems like process.cwd() might be best because it will reliably make the command share the working directory of the parent process (almost certainly gulp itself). I'll change the commit now.

[sun-zheng-an]

You forgot to modify the README.md.

Could you squash your PR into a single commit?

[coveralls]

Coverage remained the same when pulling 2c49402 on dluxemburg:cwd-options into 3ff1cf1 on sun-zheng-an:master.

[dluxemburg]

Done!

On Sunday, February 23, 2014 at 9:37 PM, sun-zheng-an wrote:

You forgot to modify the README.md (http://README.md).
Could you squash your PR into a single commit?

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