3.0.0

• Public API no longer is a function, instead exposes two functions, mock and get
• Drop support for Node.js versions less than 4.0
• Rename asPositiveInt to asIntPositive
• Rename asNegativeInt to asIntNegative
• Rename asStrictBool to asBoolStrict
• Add asFloatPositive and asFloatNegative
• Add asUrlString and asUrlObject
• Refactor code with consistent errors and structure
• Use standard for code quality and formatting