Added support to parse objects and arrays in the request for both params and body

[srinivasiyer]

The change is pretty light weight that allows nested object bodies and array notations in URLS to be validated using a '.' separator

http://localhost:3000?foo[bar]=foobar can be validated as

this.checkQuery('foo.bar').eq('foobar')

the above example would require the koa-qs library to parse the get params

Also a body of

{
  "foo": [{"bar": "foobar"}]
}

can be validated using

this.checkBody('foo.0.bar').eq('foobar', 'Needs to be foobar');

I have worked with nested bodies in many projects and this would really useful if you can merge the request.

[coveralls]

Coverage decreased (-75.67%) to 21.36% when pulling a5af795 on srinivasiyer:master into 0252d70 on RocksonZeta:master.