Fix typo.

doc/nextml2015/presentation.tex

@@ -194,7 +194,7 @@ We use the IMDB dataset.
 \begin{frame}{Project status?}
   \begin{itemize}
     \item Mature: Theano has been developed and used since January 2008 (7 yrs old)
-    \item Driven hundreads research papers
+    \item Driven hundreds research papers
     \item Good user documentation
     \item Active mailing list with participants from outside our lab
     \item Core technology for a few Silicon-Valley start-ups