Use preallocated zvals
Updated .travis.yml
Fix segfault when a call with return_value_ptr ends with an exception
Fix segfault in zim_Phalcon_Events_Manager_attach
issue-1261.phpt requires openssl
\Phalcon\Security\Exception should not inherit from \Phalcon\DI\Exception
Merge pull request #1302 from sjinks/perm-zvals

Use preallocated permanent zvals instead of null, true, false, 0 and 1