* Merge Extract and Part to the Part expression.
Renamed "MatrixBase::extract() const" to "MatrixBase::part() const"
* Renamed static functions identity, zero, ones, random with an upper case
first letter: Identity, Zero, Ones and Random.
diff --git a/doc/snippets/MatrixBase_identity.cpp b/doc/snippets/MatrixBase_identity.cpp
index cac2a72..b5c1e59 100644
--- a/doc/snippets/MatrixBase_identity.cpp
+++ b/doc/snippets/MatrixBase_identity.cpp
@@ -1 +1 @@
-cout << Matrix<double, 3, 4>::identity() << endl;
+cout << Matrix<double, 3, 4>::Identity() << endl;