* To detect a perl with ${^GLOBAL_PHASE}, check for the feature itself instead
of a specific perl version.
* Update the documentation to reflect the use of ${^GLOBAL_PHASE} if available.
* Stop depending on Scope::Guard for the tests.
* Upgrade ppport.h from version 3.13 to 3.19.
Changes 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.
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