added ->import_into() class method

This method allows the generated functions to be exported into any
package of the caller's choosing.
made tests work in Perl v5.6, Fixes #4

Previously the tests were failing in Perl v5.6 because two test files
relied on "use warnings NONFATAL=>...", which wasn't supported until
Perl v5.8. Added some workarounds for this issue.
removed some unnecessary output during testing

On some platforms and some versions of perl, one of the tests outputs a
warning due to an intentional error, which can be ignored as long as the
test passes. Because of this, I had included an informational message in
the test output, which I have now removed to un-clutter the output by
making the warning (hopefully) less confusing.
fixed minor potential bug in author tests

Fixed a remnant of some early refactoring in the author tests that would
have caused a bug if there was more than one POD file to test.
added Changes entry for c6a59eea3c5011f76