Use the same hack for post_0_11 rewrite prompt

IPython again tries to leave us without unicode in rewrite prompt. But in 
Python, one needs to be more serious than that to be actually able to do this.

powerline/bindings/ipython/post_0_11.py

@@ -1,5 +1,5 @@
 # vim:fileencoding=utf-8:noet
-from powerline.ipython import IpythonPowerline
+from powerline.ipython import IpythonPowerline, RewriteResult
 
 from IPython.core.prompts import PromptManager
 from IPython.core.hooks import TryNext
@@ -35,7 +35,11 @@ class PowerlinePromptManager(PromptManager):
 		)
 		self.txtwidth = len(res_nocolor)
 		self.width = self.txtwidth
-		return res if color else res_nocolor
+		ret = res if color else res_nocolor
+		if name == 'rewrite':
+			return RewriteResult(ret)
+		else:
+			return ret
 
 
 class ConfigurableIpythonPowerline(IpythonPowerline):

powerline/bindings/ipython/pre_0_11.py

@@ -1,5 +1,6 @@
 # vim:fileencoding=utf-8:noet
-from powerline.ipython import IpythonPowerline
+from powerline.ipython import IpythonPowerline, RewriteResult
+from powerline.lib.unicode import string
 from IPython.Prompts import BasePrompt
 from IPython.ipapi import get as get_ipython
 from IPython.ipapi import TryNext
@@ -7,30 +8,6 @@ from IPython.ipapi import TryNext
 import re
 
 
-def string(s):
-	if type(s) is not str:
-		return s.encode('utf-8')
-	else:
-		return s
-
-
-# HACK: ipython tries to only leave us with plain ASCII
-class RewriteResult(object):
-	def __init__(self, prompt):
-		self.prompt = string(prompt)
-
-	def __str__(self):
-		return self.prompt
-
-	def __add__(self, s):
-		if type(s) is not str:
-			try:
-				s = s.encode('utf-8')
-			except AttributeError:
-				raise NotImplementedError
-		return RewriteResult(self.prompt + s)
-
-
 class IpythonInfo(object):
 	def __init__(self, cache):
 		self._cache = cache

powerline/ipython.py

@@ -2,6 +2,24 @@
 
 from powerline import Powerline
 from powerline.lib import mergedicts
+from powerline.lib.unicode import string
+
+
+# HACK: ipython tries to only leave us with plain ASCII
+class RewriteResult(object):
+	def __init__(self, prompt):
+		self.prompt = string(prompt)
+
+	def __str__(self):
+		return self.prompt
+
+	def __add__(self, s):
+		if type(s) is not str:
+			try:
+				s = s.encode('utf-8')
+			except AttributeError:
+				raise NotImplementedError
+		return RewriteResult(self.prompt + s)
 
 
 class IpythonPowerline(Powerline):

powerline/lib/unicode.py

@@ -56,3 +56,10 @@ class FailedUnicode(unicode):
 	FailedUnicode.
 	'''
 	pass
+
+
+def string(s):
+	if type(s) is not str:
+		return s.encode('utf-8')
+	else:
+		return s