Use grunt for SVN deploys

[frankiejarrett]

Related to #41, not fully-automated.

@danielbachhuber You may already have a consistent way of doing releases that just isn't visible from this repo. If so, feel free to close this PR, and I can re-issue with just the readme.md file improvements.

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To bump the plugin version and perform a release tag:

cd wp-content/plugins/wp-lcache
git checkout master
npm version {major|minor|patch}

Once the release tag builds pass, deploy to WordPress.org:

echo fjarrett > svn-username
grunt deploy

[danielbachhuber]

You may already have a consistent way of doing releases that just isn't visible from this repo.

Manually, but it includes some steps that aren't easily scriptable.

If so, feel free to close this PR, and I can re-issue with just the readme.md file improvements.

That'd be great, thanks!