Add Python atomic counters

Python/05_atomic_counters.py

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+from couchbase import Couchbase
+from couchbase.exceptions import CouchbaseError
+
+cb = Couchbase.connect(bucket='default')
+
+# delete the counter, if it exists
+cb.delete('counter', quiet=True)
+
+try:
+    cb.incr('counter')
+except CouchbaseError as e:
+    print "Couldn't increment nonexistent counter", e
+
+
+# Create a counter with an initial value of 10
+rv = cb.incr('counter', initial=10)
+print "Current counter value is", rv.value
+
+# 'initial' value is ignored if counter already exists..
+print "Decrement by one.."
+rv = cb.decr('counter', initial=10)
+print "Current counter value is", rv.value
+
+print "Incrementing by 4"
+rv = cb.incr('counter', amount=4)
+print "Current counter value is", rv.value
+
+print "Decrementing by 2"
+rv = cb.decr('counter', amount=2)
+print "Current counter value is", rv.value