Revert "run tests on HHVM"
Revert "run tests on HHVM"

Since Travis-CI does not support the `pear` command on HHVM yet,
the builds are errored:
https://travis-ci.org/ricordisamoa/dvncmd

This reverts commit 6f1f339b8d551844a67b0883f9ade6f69f618ab1.

ricordisamoa/dvncmd,ricordisamoa/dvncmd