Fix some problems reported by Shaun Morris:

Fix some problems reported by Shaun Morris:
 - Looks like Stubby will need 'merge-from-array', make room for that.
 - Text format deserializer didn't correctly parse negative integers.
 - Simply 'deserialize-object' a bit
 - Fix a bug in the 'deserialize-object' that caused it not to work
   correctly on extended fields.
 - Fix a sloppy bug in 'make-tag' that only showed up in SBCL.
 - Add a few more examples, soon to be part of a test suite.

Passes 'precheckin'. Passes my by-hand tests.

git-svn-id: http://svn.internal.itasoftware.com/svn/ita/trunk/qres/lisp/quux/protobufs@543418 f8382938-511b-0410-9cdd-bb47b084005c