Returns a String description of a given object's shape.
import shape from 'object-shape';
shape('hello') // string
shape(2) // number
shape(undefined) // undefined
shape(null) // [Null]
shape({ a:1, b:2 }) // [Object a,b]
shape(/reg/i) // [RegExp]
shape(new Foo()) // [Foo a,b,c]