Add support for stdout in the fix_file rule

At least `pep8` and `py.test` consider errors as normal and print them
on stdout.

thefuck/rules/fix_file.py

@@ -25,7 +25,7 @@ patterns = (
         '^{file}: line {line}: ',
         # ghc, make, ruby, zsh:
         '^{file}:{line}:',
-        # cargo, clang, gcc, go, rustc:
+        # cargo, clang, gcc, go, pep8, rustc:
         '^{file}:{line}:{col}',
         # perl:
         'at {file} line {line}',
@@ -45,7 +45,7 @@ patterns = [_make_pattern(p) for p in patterns]
 def _search(stderr):
     for pattern in patterns:
         m = re.search(pattern, stderr)
-        if m:
+        if m and os.path.isfile(m.group('file')):
             return m
 
 
@@ -53,15 +53,15 @@ def match(command, settings):
     if 'EDITOR' not in os.environ:
         return False
 
-    m = _search(command.stderr)
-
-    return m and os.path.isfile(m.group('file'))
+    return _search(command.stderr) or _search(command.stdout)
 
 
 def get_new_command(command, settings):
-    m = _search(command.stderr)
+    m = _search(command.stderr) or _search(command.stdout)
 
     # Note: there does not seem to be a standard for columns, so they are just
     # ignored for now
-    return shells.and_('{} {} +{}'.format(os.environ['EDITOR'], m.group('file'), m.group('line')),
-                       command.script)
+    editor_call = '{} {} +{}'.format(os.environ['EDITOR'],
+                                     m.group('file'),
+                                     m.group('line'))
+    return shells.and_(editor_call, command.script)