Customize Disable Functions

[NotSoJose]

Avanti needs a way for users to specify their own 'disable_functions'.
E.g.: I needed to allow the function proc_open in 'disable_functions' and there wasn't way to let Avanti know that I need that option to be set without getting overwritten again.

avanti-core/src/pool.js

Line 27 in b7c99e0

disable_functions: 'exec,mail,passthru,popen,proc_open,show_source,shell,shell_exec,symlink,system,phpinfo',