Moved HHVM builds to Wercker CI (#3809)

* enabled wercker HHVM builds * added unit core tests * triggering tests once again * fixed removing composer.lock even if it is not present * disable linting inside hhvm * we don't need need to lint our internal tests. At least we know how to handle syntax errors in PHP tests... * fixed starting hhvm server disabled linting for most of cli tests * fixed running cli suite * removed parser Cept tests (is not a unit test, config dependent) fixed @amqp test * mysql, redis, postgresql tests added to wercker * reverted -U postgres in travis db tests

Author: DavertMik

tests/data/app/hhvm-server.ini

@@ -0,0 +1,8 @@
+hhvm.server.port = 8000
+hhvm.server.type = proxygen
+hhvm.server.default_document = index.php
+hhvm.server.error_document404 = index.php
+hhvm.repo.central.path = /var/run/hhvm/hhvm.hhbc
+hhvm.log.use_log_file = false
+hhvm.hack.lang.auto_typecheck=0
+hhvm.hack.lang.look_for_typechecker=0