0.09  Wed, 08 Aug 2012
  * Rewrite completely broken pure-perl GD detection under threads
  * Fix pure-perl implementation incorrectly reporting GD during END phase
0.08  Tue, 31 Jul 2012
  * Switch to Sub::Exporter::Progressive
0.07  Wed, 25 Jul 2012
  * Actually detect errors in pure-perl test
  * Add prototype to pure-perl pre-5.14 version
0.06  Thu, 14 Jun 2012
  * De-retardize XS-less behavior under SpeedyCGI
  * Test suite now works from within space-containing paths
0.05  Thu, 26 Apr 2012
  * Pure-perl implementation for situations where neither ${^GLOBAL_PHASE} nor
    XS are available
0.04  Sun, 03 Jul 2011 11:28:51 +0200
  * To detect a perl with ${^GLOBAL_PHASE}, check for the feature itself instead
    of a specific perl version (doy).
  * Update the documentation to reflect the use of ${^GLOBAL_PHASE} if available
    (doy).
  * Stop depending on Scope::Guard for the tests (doy).
  * Upgrade ppport.h from version 3.13 to 3.19.
0.03
  * Drop the XS code on perl versions recent enough to have ${^GLOBAL_PHASE}.
  * Drop code to support perls older than 5.6.  We've always been depending on
    5.6 anyway.
    + Use XSLoader without a fallback to DynaLoader.
    + Use our instead of use vars.