* added a pseudo expression Array giving access to:

- matrix-scalar addition/subtraction operators, e.g.:
       m.array() += 0.5;
   - matrix/matrix comparison operators, e.g.:
      if (m1.array() < m2.array()) {}
* fix compilation issues with Transform and gcc < 4.1

Eigen/Array

@@ -10,6 +10,7 @@ namespace Eigen {
 #include "src/Array/AllAndAny.h"
 #include "src/Array/PartialRedux.h"
 #include "src/Array/Random.h"
+#include "src/Array/Array.h"
 
 } // namespace Eigen