add a wip blas library built on top of Eigen. TODO:

- write extentive unit tests (maybe this already exist in other projects)
- the level2 functions still have to be implemented

CMakeLists.txt

@@ -95,7 +95,7 @@ if(MSVC)
   option(EIGEN_TEST_SSE2 "Enable/Disable SSE2 in tests/examples" OFF)
   if(EIGEN_TEST_SSE2)
     if(NOT CMAKE_CL_64)
-      # arch is not supported on 64 bit systems, SSE is enabled automatically.	
+      # arch is not supported on 64 bit systems, SSE is enabled automatically.
       set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /arch:SSE2")
     endif(NOT CMAKE_CL_64)
     message("Enabling SSE2 in tests/examples")
@@ -142,6 +142,10 @@ if(EIGEN_BUILD_DEMOS)
   add_subdirectory(demos)
 endif(EIGEN_BUILD_DEMOS)
 
+if(EIGEN_BUILD_BLAS)
+  add_subdirectory(blas)
+endif(EIGEN_BUILD_BLAS)
+
 if(EIGEN_BUILD_BTL)
   add_subdirectory(bench/btl)
 endif(EIGEN_BUILD_BTL)