Hyperscan 4.0.1

[4.0.1] 2015-10-30

• Minor cleanups to test code.
• CMake and other build system improvements.
• API update: allow hs_reset_stream() and hs_reset_and_copy_stream() to be
  supplied with a NULL scratch pointer if no matches are required. This is in
  line with the behaviour of hs_close_stream().
• Disallow bounded repeats with a very large minimum repeat but no maximum,
  i.e. {N,} for very large N.
• Reduce compile memory usage in literal set explansion for some large cases.