Merge pull request #2 from hintjens/master

Added to list of packages to install

Thanks!

README.md

@@ -1,10 +1,10 @@
-Python CFFI wrapper around the czmq zeromq bindings.
+# Python CFFI wrapper around the czmq zeromq bindings.
 
-http://czmq.zeromq.org/
+    http://czmq.zeromq.org/
 
 The documentation for this binding can be found at readthedocs:
 
-http://pyczmq.readthedocs.org/
+    http://pyczmq.readthedocs.org/
 
 This is still a work in progress, not all of the API is fully
 wrapped yet.
@@ -16,15 +16,15 @@ Some functions will probably not be wrapped, notably those that
 provide duplicate functionality to built-in python type or libraries
 like zlist, zhash, zsys, zclock, zdir, etc.
 
-Installation
+## Installation
 
 You need zmq and czmq to be installed on your system.  This code has only
 been tested with zmq 4.0.1 and czmq 2.0.2.  You can download both
 and install them with the usual configure/make/make install dance.
 
 You will also need libffi.  On Ubuntu this can be installed with 'sudo
 apt-get install libffi-dev'.  Other OSes may have a different package
-name.
+name. On Ubuntu you'll also need python-dev and python-virtualenv.
 
 After that, pyczmq can be installed from the Cheese Shop with 'pip
 install pyczmq.'
@@ -87,4 +87,5 @@ yourself with zmsg.destroy or zframe.destroy.
 Like what you see?  If you feel like leaving me or other open source
 developers a tip for our work, please visit gittip:
 
-https://www.gittip.com/michelp/
+https://www.gittip.com/michelp/
+