Merge with NicoSantangelo/SublimeLinter-contrib-flow

Hello! sorry for the delay!

I finally got around [merging](https://github.com/NicoSantangelo/SublimeLinter-contrib-flow/issues/2) the packages. I've splitted the commits in the different features so you can review them separately (and if you don't like any of them, rebase and remove them).

Try it out if you like! if anything looks suspicious let me know, I'm happy to help.

Thanks! 
The joiner could be a problem you're right. I can't find a reference in the flow docs using more than one argument in lib. I'll take a look at using a space but worst case scenario only works for one argument.

The `:` is there so SublimeLinter doesn't use anything after lib ( `--lib argument` ). From the [docs](http://sublimelinter.readthedocs.org/en/latest/linter_attributes.html#defaults):
> If ‘:’, name and the value are passed as separate arguments.

Do you think it's better if I delete it?