CrossEye/ramda — pull request #432 by Stankalank (2014-10-04 21:50:09+00:00)
Title: Add R.has function and tests

I put together this PR to add the `R.has` function. It is similar to [underscore's](http://underscorejs.org/#has) `_.has` function, except with the arguments reversed to make partial application more useful. Here are a couple of examples of its use:
```javascript
var obj = {
foo: 1,
bar: 2,
};
R.has('foo', o); //=> true

var list = [{foo: 1}, {foo: 2}, {bar: 3}];
R.filter(R.has('foo')); //=> [{foo: 1}, {foo: 2}]
```
This is one of the few functions that I find myself reaching back to underscore for so it would be great to get an even better version of this in Ramda!