diff --git a/AUTHORS.txt b/AUTHORS.txt
index 0fb69e6b..223a8c5c 100644
--- a/AUTHORS.txt
+++ b/AUTHORS.txt
@@ -30,5 +30,6 @@ ppalucky (@ppalucky)
 immerrr (@immerrr) immerrr@gmail.com
 Albertas Agejevas (@alga)
 Savor d'Isavano (@KenetJervet) <newelevenken@163.com>
+Phillip Berndt (@phillipberndt) <phillip.berndt@gmail.com>
 
 Note: (@user) means a github user name.
diff --git a/README.rst b/README.rst
index 5555936c..73b14997 100644
--- a/README.rst
+++ b/README.rst
@@ -34,7 +34,7 @@ me.
 Jedi can be used with the following editors:
 
 - Vim (jedi-vim_, YouCompleteMe_)
-- Emacs (Jedi.el_, elpy_, anaconda-mode_)
+- Emacs (Jedi.el_, elpy_, anaconda-mode_, ycmd_)
 - Sublime Text (SublimeJEDI_ [ST2 + ST3], anaconda_ [only ST3])
 - SynWrite_
 - TextMate_ (Not sure if it's actually working)
@@ -145,6 +145,7 @@ For more detailed information visit the `testing documentation
 .. _Jedi.el: https://github.com/tkf/emacs-jedi
 .. _elpy: https://github.com/jorgenschaefer/elpy
 .. _anaconda-mode: https://github.com/proofit404/anaconda-mode
+.. _ycmd: https://github.com/abingham/emacs-ycmd
 .. _sublimejedi: https://github.com/srusskih/SublimeJEDI
 .. _anaconda: https://github.com/DamnWidget/anaconda
 .. _SynWrite: http://uvviewsoft.com/synjedi/
diff --git a/docs/docs/installation.rst b/docs/docs/installation.rst
index 6d5fa42c..c6acbe96 100644
--- a/docs/docs/installation.rst
+++ b/docs/docs/installation.rst
@@ -30,18 +30,20 @@ System-wide installation via a package manager
 Arch Linux
 ~~~~~~~~~~
 
-You can install |jedi| directly from official AUR packages:
+You can install |jedi| directly from official Arch Linux packages:
 
-- `python-jedi <https://aur.archlinux.org/packages/python-jedi/>`__ (Python 3)
-- `python2-jedi <https://aur.archlinux.org/packages/python2-jedi/>`__ (Python 2)
+- `python-jedi <https://www.archlinux.org/packages/community/any/python-jedi/>`__
+  (Python 3)
+- `python2-jedi <https://www.archlinux.org/packages/community/any/python2-jedi/>`__
+  (Python 2)
 
 The specified Python version just refers to the *runtime environment* for
 |jedi|. Use the Python 2 version if you're running vim (or whatever editor you
 use) under Python 2. Otherwise, use the Python 3 version. But whatever version
 you choose, both are able to complete both Python 2 and 3 *code*.
 
-(There is also a packaged version of the vim plugin available: `vim-jedi at AUR
-<https://aur.archlinux.org/packages/vim-jedi/>`__.)
+(There is also a packaged version of the vim plugin available: `vim-jedi at
+Arch Linux<https://www.archlinux.org/packages/community/any/vim-jedi/>`__.)
 
 Debian
 ~~~~~~
diff --git a/jedi/__init__.py b/jedi/__init__.py
index 79025fb1..fc9b4690 100644
--- a/jedi/__init__.py
+++ b/jedi/__init__.py
@@ -34,7 +34,7 @@ As you see Jedi is pretty simple and allows you to concentrate on writing a
 good text editor, while still having very good IDE features for Python.
 """
 
-__version__ = '0.9.0-alpha0'
+__version__ = '0.9.0'
 
 from jedi.api import Script, Interpreter, NotFoundError, set_debug_function
 from jedi.api import preload_module, defined_names, names
diff --git a/jedi/api/__init__.py b/jedi/api/__init__.py
index 5811cc8f..3e5fb6c4 100644
--- a/jedi/api/__init__.py
+++ b/jedi/api/__init__.py
@@ -553,7 +553,7 @@ class Interpreter(Script):
     upper
     """
 
-    def __init__(self, source, namespaces=[], **kwds):
+    def __init__(self, source, namespaces, **kwds):
         """
         Parse `source` and mixin interpreted Python objects from `namespaces`.
 
@@ -567,6 +567,10 @@ class Interpreter(Script):
         If `line` and `column` are None, they are assumed be at the end of
         `source`.
         """
+        if type(namespaces) is not list or len(namespaces) == 0 or \
+           any([type(x) is not dict for x in namespaces]):
+            raise TypeError("namespaces must be a non-empty list of dict")
+
         super(Interpreter, self).__init__(source, **kwds)
         self.namespaces = namespaces
 
diff --git a/jedi/utils.py b/jedi/utils.py
index 9148c773..6b48ef49 100644
--- a/jedi/utils.py
+++ b/jedi/utils.py
@@ -108,7 +108,7 @@ def version_info():
     Returns a namedtuple of Jedi's version, similar to Python's
     ``sys.version_info``.
     """
-    Version = namedtuple('Version', 'major, minor, micro, releaselevel, serial')
+    Version = namedtuple('Version', 'major, minor, micro')
     from jedi import __version__
     tupl = re.findall('[a-z]+|\d+', __version__)
     return Version(*[x if i == 3 else int(x) for i, x in enumerate(tupl)])
diff --git a/setup.py b/setup.py
index b623d22f..85dee723 100755
--- a/setup.py
+++ b/setup.py
@@ -42,6 +42,7 @@ setup(name='jedi',
           'Programming Language :: Python :: 3',
           'Programming Language :: Python :: 3.2',
           'Programming Language :: Python :: 3.3',
+          'Programming Language :: Python :: 3.4',
           'Topic :: Software Development :: Libraries :: Python Modules',
           'Topic :: Text Editors :: Integrated Development Environments (IDE)',
           'Topic :: Utilities',