4.0.0-beta1

• #258: Support for expanding events that use RDATE. (@jabdoa2)
• #258: Correctly support TZID for events that use RDATE. (@jabdoa2)
• #240: Component\VCalendar::expand() now returns a new expanded VCalendar
  object, instead of editing the existing VCalendar in-place. This is a BC
  break.
• #265: Using the new InvalidDataException in place of
  InvalidArgumentException and LogicException in all places where we fail
  because there was something wrong with input data.
• #227: Always add VALUE=URI to PHOTO properties.
• #235: Always add VALUE=URI to URL properties.
• It's now possible to override which class is used instead of
  Component\VCalendar or Component\VCard during parsing.
• #263: Lots of small cleanups. (@jakobsack)
• #220: Automatically stop recurring after 3500 recurrences.
• #41: Allow user to set different encoding than UTF-8 when decoding vCards.
• #41: Support the ENCODING parameter from vCard 2.1.
  Both ISO-8859-1 and Windows-1252 are currently supported.
• #185: Fix encoding/decoding of TIME values in jCal/jCard.