Roadmap towards a v1.2.0

[Yomguithereal]

• : More precise errors.
• : Partial validation through the ~ sigil.
• : Flags (regex like)
• : Possibility to pass functions as type as a shortcut (sometimes, you just want a one-time validation and do not want to be bothered by custom types creation).
• : Adding some ES6-related types.

@jacomyal: sounds good?