Bump to 0.17.0, fix markup in CHANGES

Author: asvetlov

CHANGES.txt

@@ -1,6 +1,9 @@
 CHANGES
 =======
 
+0.17.0a0 (XX-XX-XXXX)
+-------------------
+
 0.16.3 (05-30-2015)
 -------------------
 
@@ -10,7 +13,7 @@ CHANGES
 -------------------
 
 - Update python version required for `__del__` usage: it's actially
-   3.4.1 instead of 3.4.0
+  3.4.1 instead of 3.4.0
 
 - Add check for presence of loop.is_closed() method before call the
   former #378

aiohttp/__init__.py

@@ -1,6 +1,6 @@
 # This relies on each of the submodules having an __all__ variable.
 
-__version__ = '0.16.3'
+__version__ = '0.17.0a0'
 
 
 from . import hdrs  # noqa