Log Message:
Update lang/nodejs4 to 4.4.5.

buffer:
- Buffer no longer errors if you call lastIndexOf with a search
  term longer than the buffer

contextify:
- Context objects are now properly garbage collected, this solves
  a problem some individuals were experiencing with extreme memory
  growth

deps:
- update npm to 2.15.5

http:
- Invalid status codes can no longer be sent. Limited to 3 digit
  numbers between 100 - 999