Rewrite of the connection setup.

I'd want to advice against using `use_connection()` more, as the
connection setup is less explicit, and also pollutes global memory.

Because, well:

    $ python -m this | head -n4 | tail -n1

;)

examples/run_example.py

@@ -1,22 +1,22 @@
 import os
 import time
-from rq import Queue, use_connection
+from rq import Queue, Connection
 from fib import slow_fib
 
-# Tell RQ what Redis connection to use
-use_connection()
-# Range of Fibonacci numbers to compute
-fib_range = range(20, 34)
 
-# Kick off the tasks asynchronously
+def main():
-async_results = {}
+    # Range of Fibonacci numbers to compute
-q = Queue()
+    fib_range = range(20, 34)
-for x in fib_range:
+
+    # Kick off the tasks asynchronously
+    async_results = {}
+    q = Queue()
+    for x in fib_range:
         async_results[x] = q.enqueue(slow_fib, x)
 
-start_time = time.time()
+    start_time = time.time()
-done = False
+    done = False
-while not done:
+    while not done:
         os.system('clear')
         print 'Asynchronously: (now = %.2f)' % (time.time() - start_time)
         done = True
@@ -31,4 +31,10 @@ while not done:
         print '    python examples/run_worker.py'
         time.sleep(0.2)
 
-print 'Done'
+    print 'Done'
+
+
+if __name__ == '__main__':
+    # Tell RQ what Redis connection to use
+    with Connection():
+        main()

examples/run_worker.py

@@ -1,8 +1,8 @@
-from rq import Queue, Worker, use_connection
+from rq import Queue, Worker, Connection
 
-# Tell rq what Redis connection to use
-use_connection()
 
 if __name__ == '__main__':
+    # Tell rq what Redis connection to use
+    with Connection():
         q = Queue()
         Worker(q).work()