2015-08-04 io.js v3.0.0 Release

Notable changes:

* buffer:
  - Due to changes in V8, it has been necessary to reimplement Buffer
    on top of V8's Uint8Array. While every effort has been made to
    maintain performance, users are likely to experience a different
    performance profile depending on how Buffer is used.
    (Trevor Norris) #1825.
  - Buffer can now take ArrayBuffers as a constructor argument
    (Trevor Norris) #2002.
  - When a single buffer is passed to Buffer.concat(), a new, copied
    Buffer object will be returned; previous behavior was to return
    the original Buffer object (Sakthipriyan Vairamani) #1937.
* build: PPC support has been added to core to allow compiling on
  pLinux BE and LE (AIX support coming soon) (Michael Dawson) #2124.
* dgram: If an error occurs within socket.send() and a callback has
  been provided, the error is only passed as the first argument to the
  callback and not emitted on the socket object; previous behavior was
  to do both (Matteo Collina & Chri...