Build namespaces need more options

[blakef]

Overview

Currently builds allow namespaces to be built by referencing the namespace as a string argument:

new JSONifier({namespace: 'a'}).add({'b': 'c'}).build('a')
> {'b': 'c'}

Limits

We need more options to allow output to be customised. Namespaces should be used for 2 cases:

• differentiate between various parts of a composite JSON object (I want to use namespaces to include or exclude inherited JSON),
• represent actual key values (I want the namespaces included in the output)

Future

1. Allow: string and object arguments to build:

.build('a')
.build({namespace:'a'}) 

1. Allow multiple namespaces to be build:

.build({namespace:['a', 'b', 'c']}) 

1. Allow namespaces to be merged

let a = new JSONifier({namespace: 'a'})
   .add({'a': '1'})
   .add({'b': '2'});
let b = new JSONifier({namespace: 'b'})
   .add({'b': 'woot'});

b.build('a').next().value
> {'a': '1', 'b': '2'}
b.build({namespace: 'a'}).next().value
> {'a': '1', 'b': '2'}

b.build('b').next().value
> {'b': 'woot'}

b.build().next().value
> {'a': {'a': '1', 'b': '2'}, 'b': {'b': 'woot'}}

b.build({nest: false}).next().value
> {'a': '1', 'b': 'woot'}