Various fixes and improvements

• Use a automatic rule that fills the footer.
• Use the in-line logo for the footer, as in the PPT template.
• Cleaner README and example.
• Fix thanks footer spacing and hyphens.
• Fix section slide's rule length.

PasTeX.cls

@@ -214,7 +214,7 @@
         {
             \hspace{-22mm}
             \begin{minipage}[t]{1.29\textwidth}
-                \vspace*{-2ex}
+                \vspace*{-3ex}
                 \fontsize{5}{5.5}\selectfont
                 {
                     \begin{color}{pasteur-blue}