Rename config param from opensocial-0.8 to opensocial

[awiner, 2009-07-18 00:45:14]

This changes the name of the config entry from "opensocial-0.8" (just wrong,
since it applies to all opensocial versions) to "opensocial".  As a consequence
of the Java config loading code, this necessitates introducing an "opensocial"
feature, and making "opensocial-0.9" a trivial alias.

This includes a .php change, which is totally untested, but seemed the right
thing, so putting Chris on the review as well.

[Paul Lindner, 2009-07-20 16:53:44]

lgtm -- one thing I would do is to insure that we communicate this change to
implementers to avoid upgrade breakage.

[chabotc, 2009-07-20 18:53:43]

lgtm & thanks for the heads up