0.9.0: Types

• Added support for $arg ==> $arg++ lambdas without argument braces
  (@thekid)
• Fixed issue #8: Member types missing for constructor argument promotion
  (@thekid)
• Fixed issue #7: Ternary operator broken - @thekid
• Fixed issue #6: instanceof does not resolve class names - @thekid
• Implemented support for union types, e.g. int|float, as supported
  by this PHP RFC
  (@thekid)
• Implemented array<int> and array<string, string> as well as
  function types (e.g. (function(int, string): string)) as seen in
  Hack's type system
  (@thekid)