[docs] warnings about windows + python 3 in faq and install

docs/faq.rst

@@ -71,7 +71,7 @@ What Python versions does Scrapy support?
 
 Scrapy is supported under Python 2.7 and Python 3.3+.
 Python 2.6 support was dropped starting at Scrapy 0.20.
-Python 3 support was added in Scrapy 1.1.
+Python 3 support was added in Scrapy 1.1. Python 3 is not yet supported on Windows.
 
 Did Scrapy "steal" X from Django?
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docs/intro/install.rst

@@ -11,7 +11,7 @@ Installing Scrapy
 
 The installation steps assume that you have the following things installed:
 
-* `Python`_ 2.7
+* `Python`_ 2.7 or above 3.3
 
 * `pip`_ and `setuptools`_ Python packages. Nowadays `pip`_ requires and
   installs `setuptools`_ if not installed. Python 2.7.9 and later include
@@ -85,6 +85,10 @@ Windows
 
       pip install Scrapy
 
+.. note::
+     Python 3 is not supported on Windows. Installation of Scrapy on Windows
+     with Python 3 will fail.
+
 Ubuntu 9.10 or above
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