Add the following classes and methods.

- hoon.json
- hoon.json.parse()
- hoon.json.stringify()
- hoon.WebStorage
- hoon.WebStorage.getItem()
- hoon.WebStorage.setItem()
- hoon.WebStorage.removeItem()
- hoon.WebStorage.clear()
- hoon.WebStorage.key()
- hoon.WebStorage.get()
- hoon.WebStorage.set()
- hoon.WebStorage.remove()
- hoon.localStorage
- hoon.sessionStorage