Care for import aliases better.

jedi/parser/representation.py

@@ -1077,6 +1077,12 @@ class Import(Simple):
         raise NotImplementedError
 
     def path_for_name(self, name):
+        try:
+            # The name may be an alias. If it is, just map it back to the name.
+            name = self.aliases()[name]
+        except KeyError:
+            pass
+
         for path in self._paths():
             if name in path:
                 return path[:path.index(name) + 1]
@@ -1108,6 +1114,11 @@ class ImportFrom(Import):
     def get_defined_names(self):
         return [alias or name for name, alias in self._as_name_tuples()]
 
+    def aliases(self):
+        """Mapping from alias to its corresponding name."""
+        return dict((alias, name) for name, alias in self._as_name_tuples()
+                    if alias is not None)
+
     def _as_name_tuples(self):
         last = self.children[-1]
         if last == ')':
@@ -1152,6 +1163,10 @@ class ImportName(Import):
         else:
             return [self.children[1:]]
 
+    def aliases(self):
+        raise NotImplementedError
+        return []
+
 
 class KeywordStatement(Simple):
     """