get rid of RecyclingFastBufferedOutputStream, which was supposed to avoid allocating a buffer every time it was allocated, but didn't because FastBufferedOutputStream always goes and allocates its own anyway (in this old version of fastutil); also, lazily initialize RecordingOutputStream.diskStream
Merge pull request #6 from nlevitt/no-recycling

get rid of RecyclingFastBufferedOutputStream, which was supposed to avoi...