Fixes #73. Replace ngmin with ngAnnotate to fix npm install deprecation warning

npm install --save did that automatically, not sure what it's reasoning 
is!

On Fri, Aug 22, 2014 at 7:44 PM, Florian Rathgeber 
<notifications@github.com> wrote:
> In package.json:
> 
> >      "grunt-google-cdn": "~0.2.0",
> >      "grunt-newer": "~0.6.1",
> > -    "grunt-ngmin": "~0.0.2",
> > +    "grunt-ng-annotate": "^0.3.2",
> Is there a particular reason for using ^0.3.2 rather than ~0.3.2?
> 
> —
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