Started a Transform class in the Geometry module to represent

homography.
Fix indentation in Quaternion.h

Eigen/src/Core/util/StaticAssert.h

@@ -57,7 +57,8 @@
       enum {
         you_tried_calling_a_vector_method_on_a_matrix,
         you_mixed_vectors_of_different_sizes,
-        you_mixed_matrices_of_different_sizes
+        you_mixed_matrices_of_different_sizes,
+        you_did_a_programming_error
       };
     };