Array support

[JoeBartelmo]

So this was a little convoluted, and I think this is an appropriate fix.

Essentially the issue is primarily with the way this module is calling the chimp executable. According to the documentation located here tags need to be passed in 2 ways. If we want to AND tags together, we need to have
--tag=@tagname --tag=@tagname2 where as if we want to OR: --tag=@tagname,@tagname2

This chimp module grabs the pre-formatted arguments. So if we pass it an array, the translation is the following: tags: ['@tag1', '@tag2'] ~> '@tag1,@tag2' which isn't want we want all the time. So this fix allows you to pass an array of tags to support so if you want @tag1 AND @tag2 OR @tag3 we would pass: tags: JSON.stringify(['@tag1', '@tag2,@tag3'])

This does not break any functional code, so if people pass in tags: '@tag1,tag2' it will work fine.

I have changed your test grunt file to accomidate and demonstrate these changes, i recommend you start the code review there.

[JoeBartelmo]

@btburton42

[btburton42]

@JoeBartelmo what version of node are you using? I'm on 8.1.2 and it's failing to run tests due to what I believe to be a bug in the Chimp lib.

[JoeBartelmo]

@btburton42 Sorry I didn't see your message. I'm on the current LTS version of node