Updated all of the matcher classes in sleekxmpp.xmlstream.matcher.

Matchers are now PEP8 compliant and have documentation.

sleekxmpp/xmlstream/matcher/stanzapath.py

@@ -5,10 +5,34 @@
 
     See the file LICENSE for copying permission.
 """
-from . import base
-from xml.etree import cElementTree
 
-class StanzaPath(base.MatcherBase):
+from sleekxmpp.xmlstream.matcher.base import MatcherBase
 
-	def match(self, stanza):
-		return stanza.match(self._criteria)
+
+class StanzaPath(MatcherBase):
+
+    """
+    The StanzaPath matcher selects stanzas that match a given "stanza path",
+    which is similar to a normal XPath except that it uses the interfaces and
+    plugins of the stanza instead of the actual, underlying XML.
+
+    In most cases, the stanza path and XPath should be identical, but be
+    aware that differences may occur.
+
+    Methods:
+        match -- Overrides MatcherBase.match.
+    """
+
+    def match(self, stanza):
+        """
+        Compare a stanza against a "stanza path". A stanza path is similar to
+        an XPath expression, but uses the stanza's interfaces and plugins
+        instead of the underlying XML. For most cases, the stanza path and
+        XPath should be identical, but be aware that differences may occur.
+
+        Overrides MatcherBase.match.
+
+        Arguments:
+            stanza -- The stanza object to compare against.
+        """
+        return stanza.match(self._criteria)