Log Message:
Update 2.20 to 2.22
-------------------
2.21 2015-02-17 rurban
   - Add leaktrace test
   - Add .gitignore

2.22 2015-02-17 rurban
   - Fixed huge decompress memory leak, leaking every single XS outbut buffer.
   - Better memory leak testcase with Memory::Dump, t/090-memory-usage.pl
     (RT #102211 by Nick Koston)
   - clarify docs that deflate = compress, inflate = uncompress