_.lambda function shortcut

I find my self writing a lot of anonymous functions for accessing properties.  `pluck` helps with this a little, but in some cases it's not practical.  This also has the benifit of converting functions to work as Underscore iterator.  Essentially it does the following.

    // old way
    _.map(obj, function(o){ return o.prop.method(); }
    // new way
    _.map(obj, _.lambda("prop.method()");

It also allows adding data, which for ease-of-use is sent to all functions called in the `prop` parameter (this is rarely a problem considering most people will call only one function).

Sorting becomes easier.

```
_.sortBy([
    {score: 50},
    {score: 93},
    {score: 31},
    ], _.lambda('score')
```

Is this really a word?  Remember **i** before **e** except after **c**.

```
var word_tests = [
    /[aeiou]/gi,
    /^[A-Za-z-]+$/,
    /^(?!.*([^c])ei)/
];

var userInput = "pneil";
var verdict = _.all(word_tests, _.lambda("test()", userInput));
```