[Commotion-dev] minimum OSX version to support

[Hans-Christoph Steiner]

So we have a Commotion Meshbook build working for 10.7 and 10.8, but not older
versions of Mac OS X.  We figure this is a good place to start.  How essential
is 10.6 support at this point?  Its feasible with the current code, but
tricky.  Older than 10.6 would require big changes to the app since the APIs
have changed a lot.

.hc