use grffile to support notebooks with spaces

IPython/nbconvert/templates/latex/sphinx.tplx

@@ -95,6 +95,9 b' Note: For best display, use latex syntax highlighting. =))'
     \graphicspath{ {figs/} }
     \usepackage[Export]{adjustbox} % To resize
 
+    % used so that images for notebooks which have spaces in the name can still be included
+    \usepackage{grffile}
+
 
     % For formatting output while also word wrapping.
     \usepackage{listings}
@@ -463,4 +466,4 b' Note: For best display, use latex syntax highlighting. =))'
     \includegraphics[max size={\textwidth}{\textheight}]{((( path )))}
     \par
     \end{center}
-((*- endmacro *))
  No newline at end of file
+((*- endmacro *))