spendfrom.py sends coins from a particular address or addresses

Should be both useful and also a pretty good demonstration of
using the raw transactions API.

contrib/spendfrom/setup.py

@@ -0,0 +1,9 @@
+from distutils.core import setup
+setup(name='btcspendfrom',
+      version='1.0',
+      description='Command-line utility for bitcoin "coin control"',
+      author='Gavin Andresen',
+      author_email='gavin@bitcoinfoundation.org',
+      requires=['jsonrpc'],
+      scripts=['spendfrom.py'],
+      )