Building Grilo with Gobject Introspection enabled

[Simón Pena <spenap gmail com>]

Hi all,

Right now, to build Grilo with GObject Introspection support, you'll
need to use the tag "GOBJECT_INTROSPECTION_0_9_3"

We're working to get Grilo working with their current HEAD, but right
now there are some issues at least with their GParamSpec support, and
many of Grilo's functions appear as non-introspectable.

Cheers,

Simón