Cosmetic changes to part 0 of the programmers' tutorial.

docs/programmers/tutorials/workflows/part00.tex

@@ -95,13 +95,17 @@
 
     \+ \textbf{If you have a question, just ask -- don't wait.}
 
+
     \+
     After the course is over, \\ you're very welcome to keep asking questions:
     \\[1ex]
-    on the mailing-list: \\
+    $\blacktriangleright$ in the GC3Pie chat room:
+    {\small \url{http://gitter.im/gc3pie/chat}}
+    \\[1ex]
+    $\blacktriangleright$ on the mailing-list:
     \href{mailto:gc3pie@googlegroups.com}{gc3pie@googlegroups.com}
     \\[1ex]
-    or through the forum web interface: \\
+    $\blacktriangleright$ or through the forum web interface: \\
     {\small \url{https://groups.google.com/d/forum/gc3pie}}
   \end{center}
 \end{frame}