Fatal: Fix CORE leak trampoline for slurping args

When the prototype of a CORE sub has a slurping element, the generated
trampoline would fail to handle "extra" arguments.

Signed-off-by: Niels Thykier <niels@thykier.net>
Tests for leak guard failure with slurpy subs. GH #22
Remove test debugging messages.
Merge pull request #22 from nthykier/fix-core-leak-calls

Fatal: Fix CORE leak trampoline for slurping args
core-trampoline-slurp.t test fixes.
Document GH #22 fixes for leaky slurpy core subs.
v2.19

        * BUGFIX: Loading a file that does not change packages while
          autodie in effect no longer causes weird behaviour when
          slurpy built-ins (like open() and unlink()) are called. GH #22
          Thanks to Niels Thykier.

        * TEST: Tests for leak guard failures for slurpy core functions.
Version bump
s{http://github}{https://github}

Fix Github link to https.
Merge pull request #24 from dolmen/patch-1

s{http://github}{https://github}