1.0.0: Parameter annotations

• Indexed type members by name; implementing feature suggested in #10
  (@thekid)
• Heads up: Implemented syntax for parameter annotations as stated
  in issue #1 - alongside the parameter; no longer in its "targeted" form
  $param: inject as in xp-framework/rfc#218
  (@thekid)
• Added support for keywords as methods in PHP 5.6 - @thekid
• Implemented xp-framework/rfc#326: Cast and nullable types - @thekid
• Added support for casting value and array types - @thekid