# Functions
Is detects whether the input stream is compressed.
Peek detects whether the input stream is gzip compressed.
ReadCloser reads uncompressed input data from the io.ReadCloser and returns an io.ReadCloser from which compressed data may be read.
ReadCloserLevel reads uncompressed input data from the io.ReadCloser and returns an io.ReadCloser from which compressed data may be read.
UnzipReadCloser reads compressed input data from the io.ReadCloser and returns an io.ReadCloser from which uncompessed data may be read.
# Interfaces
PeekReader is an io.Reader that also implements Peek a la bufio.Reader.