add testing for php 5.6 and hhvm (allow failures)
Merge pull request #130 from br00k/fix/update-testing

add testing for php 5.6 and hhvm (allow failures)
Fix a bug in Memcache.php that would cause every fetch to also
result in a push if multiple memcache servers were being used.

The original code compared the parsed data structures using ===,
but that always fails because that just does a pointer comparison
and not a deep comparison.

Changed the code to compare the original unparsed values instead.
Also added a few debug-level log statements.