Merge #150: Make it possible to explicitly close RPC connection

1ea9661 make it possible to explicitly close connection (Simon Mulser)
4df1bbb fix PEP8 too many blank lines (Simon Mulser)

Pull request description:

  So far it is not possible to close a connection. you need to hope that GC does it or access `__connection` over the `__dict__` variable.

  This PR let the proxy expose a proper `close()` function.

Tree-SHA512: 721c4bd250549264ec54b3a2f8c333dcd55ed90cfc9ff7e8720c2243ada3639785889e52adc6a2fdf4b5c670bc54e3c127b57b04215cc119d419e79794107598

Author: petertodd

bitcoin/rpc.py

@@ -197,7 +197,6 @@ def __init__(self,
         self.__conn = httplib.HTTPConnection(self.__url.hostname, port=port,
                                              timeout=timeout)
 
-
     def _call(self, service_name, *args):
         self.__id_count += 1
 
@@ -226,7 +225,6 @@ def _call(self, service_name, *args):
         else:
             return response['result']
 
-
     def _batch(self, rpc_call_list):
         postdata = json.dumps(list(rpc_call_list))
 
@@ -251,6 +249,10 @@ def _get_response(self):
         return json.loads(http_response.read().decode('utf8'),
                           parse_float=decimal.Decimal)
 
+    def close(self):
+        if self.__conn is not None:
+            self.__conn.close()
+
     def __del__(self):
         if self.__conn is not None:
             self.__conn.close()