skratchdot / random-picker / 9 / 2

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Pull #4

travis-ci

Allow zero probability

This allows for:

```js
picker.option('name', 0)
```

Might also want to look into the logic here:

```js
if (!Number.isFinite(num) || num < 0) {
  num = 0;
}
```

If a number is infinity, one would not want the probability to be zero.

Fixes issue #3

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