Removed easy_install from installation documentation

Also worded the use of 'sudo' a bit more carefully.
diff --git a/doc/installation.rst b/doc/installation.rst
index 578dc86..fa0b16b 100644
--- a/doc/installation.rst
+++ b/doc/installation.rst
@@ -5,20 +5,15 @@
 or easy_install. Either one will work::
 
     pip install rsa
-    easy_install rsa
 
-Depending on your system you may need to use ``sudo pip`` or ``sudo
-easy_install``.
+Depending on your system you may need to use ``sudo pip`` if you want to install
+the library system-wide.
 
 Installation from source is also quite easy. Download the source and
 then type::
 
     python setup.py install
 
-or if that doesn't work::
-
-    sudo python setup.py install
-
 
 The sources are tracked in our `Git repository`_ at
 Github. It also hosts the `issue tracker`_.
@@ -49,7 +44,7 @@
 
 Once these are installed, use Git_ to get a copy of the source::
 
-    hg clone https://github.com/sybrenstuvel/python-rsa.git
+    git clone https://github.com/sybrenstuvel/python-rsa.git
     python setup.py develop
 
 .. _Git: https://git-scm.com/