Create hphpize man page

Summary: In addition to our hhvm man page, Debian also wants a man page for hphpize that describes how to create dynamically shared objects.

Reviewed By: @ptarjan

Differential Revision: D1556869
Add cli config options to hhvm wrapper

Summary: We added the ability to specify config files; now let's have cli options too.

(I am thinking of possible short options for these too, down the road)

Reviewed By: @ptarjan

Differential Revision: D1554418