Fix memory leak in TSRM
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  Fix memory leak in TSRM
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  Fix memory leak in TSRM
Merge branch 'PHP-5.6'

* PHP-5.6:
  Fix memory leak in TSRM
make release tags not fail Travis CI