Io_lib 1.13.4 released

Primarily a bug fix release and minor updates to conform to the recent 2.1 CRAM specification update. From the CHANGES file:

Version 1.13.4 (17th February 2014)

• BAM: Fixed some buffer overruns in BAM decoding.

• CRAM: Added support for CRAM EOF blocks (new in CRAM v2.1
  specification). Also improved BAM EOF block checking. v2.1 is now
  the default output version.

• CRAM: Fixed an error causing multi-threading to take longer for the
  first additional thread.

• CRAM: Improved memory-caching of reference sequences when fetching
  via MD5 path. Also reduced memory used when loading via REF_PATH.

• CRAM: Experimental / alpha quality code for CRAM version 3.0,
  including new codecs (rANS & arithmetic coders) and CRCs.

• CRAM: Small improvements to the bzip2 (-j) mode. It now periodically
  tests bzip2 vs gzip and uses whichever is best rather than forcing
  all compression to go via bzip2.

• CRAM: Fixed crash when handling CRAM files with non-sequential
  reference IDs.

• Scramble: Now supports 8-way quality binning as an output option.

• Index_tar: Fixed debian bug #729276 - buffer overflow.

• Improved Windows building via cross-compilation.