track: adding simple identify tests
Merge branch 'master' of github.com:segmentio/facade
identify: adding fixes for `lastName` with multiple spaces

A customer was sending the following trait:

```js
{ name: 'John  Doe' }
```

This makes sure to return `identify.lastName()` as `'Doe'` rather than
`''`.
trim: adding trim dependency for browser usage
0.1.3

  969623e  track: adding simple identify tests
  f5f2482  identify: adding fixes for `lastName` with multiple spaces
  e682e47  trim: adding trim dependency for browser usage