Add hhvm.

Signed-off-by: crynobone <crynobone@gmail.com>
Fixes `Cannot redeclare crypt_random_string()` issue when developing
with workbench. Closes #28.

Signed-off-by: crynobone <crynobone@gmail.com>
Small tweak.

Signed-off-by: crynobone <crynobone@gmail.com>
Update guide for using with workbench.

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.1'