v0.3.0

• All encode and decode methods no longer return null, instead, throws an error:
  • For decode, toCSSSheet, toCSSObject and toSVG, invalid hash causes an error.
  • For encode, the component constraint and resolution-pixel mismatch causes an error.
• Encode validation is now done in JS rather than in AssemblyScript. This is to throw an error as early as possible.