adding more core folks

docs/source/about/credits.txt

@@ -19,10 +19,10 b' developers:'
   Code project, work on IPython's core.
 
 * **Brian Granger** <ellisonbg-AT-gmail.com> Parallel computing 
-  infrastructure, IPython core.
+  infrastructure, IPython core, IPython notebook.
 
 * **Benjamin (Min) Ragan-Kelley** <benjaminrk-AT-gmail.com> Parallel computing
-  infrastructure.
+  infrastructure, IPython core, IPython notebook.
 
 * **Ville Vainio** <vivainio-AT-gmail.com> IPython core, maintainer of IPython
   trunk from version 0.7.2 to 0.8.4.
@@ -42,6 +42,15 b' developers:'
 
 * **Evan Patterson** <epatters-AT-enthought.com> Qt console frontend with ZeroMQ.
 
+* **Paul Ivanov** <pi-AT-berkeley.edu> IPython core, documentation.
+
+* **Matthias Bussonnier** <bussonniermatthias-AT-gmail.com> IPython notebook,
+  nbviewer, nbconvert.
+
+* **Julian Taylor** <jtaylor.debian-AT-googlemail.com> IPython core, Debian packaging.
+
+* **Brad Froehle** <brad.froehle-AT-gmail.com> IPython core.
+
 
 Special thanks
 ==============