3.0.0-beta1

• Added: jsonSerialize() for creating jCal and jCard documents.
• Added: helper method to parse vCard dates and times.
• Added: Specialized classes for FLOAT, LANGUAGE-TAG, TIME, TIMESTAMP,
  DATE-AND-OR-TIME, CAL-ADDRESS, UNKNOWN and UTC-OFFSET properties.
• Removed: CommaSeparatedText property. Now included into Text.
• Fixed: Multiple parameters with the same name are now correctly encoded.
• Fixed: Parameter values containing a comma are now enclosed in double-quotes.
• Fixed: Iterating parameter values should now fully work as expected.
• Fixed: Support for vCard 2.1 nameless parameters.
• Changed: $valueMap, $componentMap and $propertyMap now all use fully-qualified
  class names, so they are actually overridable.
• Fixed: Updating DATE-TIME to DATE values now behaves like expected.