Add issue to matrix about duplicated code

Author: dirkschulze

matrix/index.html

@@ -713,6 +713,9 @@ <h3>Helper methods</h3>
     <section>
       <h2>Decomposing the Matrix</h2>
 
+      <p class='issue'>It is unsure if Transformation Matrix should reference the code of CSS3 Transforms
+        or the other way around. Clearly we do not need the code twice.
+      </p> 
       <p>
         The pseudocode below is based upon the "unmatrix" method in "Graphics Gems II,
         edited by Jim Arvo", but modified to use Quaternions instead of Euler angles to
@@ -853,6 +856,10 @@ <h2>Decomposing the Matrix</h2>
     <section>
       <h2>Recomposing the Matrix</h2>
 
+      <p class='issue'>
+        Same as for decompose matrix
+      </p>
+
       <p>
         After interpolation the resulting values are used to transform the elements user
         space. One way to use these values is to recompose them into a 4x4 matrix. This can