reorganize header files, split MatrixBase into smaller files.
expose only a few meta-headers to the user, the rest moves to a internal/ subdirectory
diff --git a/doc/tutorial.cpp b/doc/tutorial.cpp
index 967f0a5..3b44895 100644
--- a/doc/tutorial.cpp
+++ b/doc/tutorial.cpp
@@ -1,4 +1,4 @@
-#include"../src/All.h"
+#include "../src/All"
 
 using namespace std;
 using namespace Eigen;