Log Message:
Update to 0.18

Upstream changes:
0.18      2013-05-13 12:34:52 PDT-0700
    - make tests a bit more tolerant of slow systems, by waiting longer for
      processes to die (RT#85229, Chisel Wright)

0.17  2013-04-20
    - Makefile.PL now prevents installation on MSWin32

0.16  2013-04-14
    - fix incompatibilities with Test::Builder 1.005+ (schwern, RT#76523)
    - add missing dependency on the version of File::Path which added
      make_path (RT#79169, Jonathan Sailor)
    - add missing test dependency on Test::Exception (RT#70382)
    - document the 'basedir' attribute and its behaviour (RT#83055)
    - add 'documentation' keys for public attributes, to be used when
      displaying --help (RT#54295)