Simplified SleekTest.

* check_stanza does not require stanza_class parameter. Introspection!
* check_message, check_iq, and check_presence removed -- use check
  instead.
* stream_send_stanza, stream_send_message, stream_send_iq, and
  stream_send_presence removed -- use send instead.
* Use recv instead of recv_message, recv_presence, etc.
* check_jid instead of check_JID
* stream_start may accept multi=True to return a new SleekTest instance
  for testing multiple streams at once.

tests/test_stanza_error.py

@@ -7,7 +7,7 @@ class TestErrorStanzas(SleekTest):
         """Test setting initial values in error stanza."""
         msg = self.Message()
         msg.enable('error')
-        self.check_message(msg, """
+        self.check(msg, """
           <message type="error">
             <error type="cancel">
               <feature-not-implemented xmlns="urn:ietf:params:xml:ns:xmpp-stanzas" />
@@ -20,7 +20,7 @@ class TestErrorStanzas(SleekTest):
         msg = self.Message()
         msg['error']['condition'] = 'item-not-found'
 
-        self.check_message(msg, """
+        self.check(msg, """
           <message type="error">
             <error type="cancel">
               <item-not-found xmlns="urn:ietf:params:xml:ns:xmpp-stanzas" />
@@ -32,7 +32,7 @@ class TestErrorStanzas(SleekTest):
 
         msg['error']['condition'] = 'resource-constraint'
 
-        self.check_message(msg, """
+        self.check(msg, """
           <message type="error">
             <error type="cancel">
               <resource-constraint xmlns="urn:ietf:params:xml:ns:xmpp-stanzas" />
@@ -48,7 +48,7 @@ class TestErrorStanzas(SleekTest):
 
         del msg['error']['condition']
 
-        self.check_message(msg, """
+        self.check(msg, """
           <message type="error">
             <error type="cancel">
               <text xmlns="urn:ietf:params:xml:ns:xmpp-stanzas">Error!</text>
@@ -64,7 +64,7 @@ class TestErrorStanzas(SleekTest):
 
         del msg['error']['text']
 
-        self.check_message(msg, """
+        self.check(msg, """
           <message type="error">
             <error type="cancel">
               <internal-server-error xmlns="urn:ietf:params:xml:ns:xmpp-stanzas" />