fallbackFlagInUnkownNanp doesn't seem to work when countriesData is passed

[brunops]

Hey Patrick, I was finally playing with the fallbackFlagInUnkownNanp option, but it doesn't seem to work.

I noticed 2 issues in the PR:

1. Minor typo in the description https://github.com/patw0929/react-intl-tel-input/pull/110/files#diff-3ec40a1e2a924ba4ba6521185d17b0f2R229
2. While debugging, although fallbackFlagInUnkownNanp is set to false, the alreadySelected variable is false as well (as the Puerto Rico example if you remember), so the fallback executes and the same problem happens https://github.com/patw0929/react-intl-tel-input/pull/110/files#diff-8d03d40cef8605ae4608d7284524a5b7R486

here's a cryptic screenshot that might help, the problem might be of how utils.getNumeric work (+1 returns "us", although

It might be the case that this only happens when this.props.countriesData is passed and hence why your tests possibly worked. Do you think this is the wrong place to initialize the countries? https://github.com/patw0929/react-intl-tel-input/blob/master/src/containers/IntlTelInputApp.js#L608

sorry for opening all these issues :/