Removed superfluous includes, documentation updates.

src/AbstractShaderProgram.h

@@ -19,10 +19,8 @@
  * @brief Class Magnum::AbstractShaderProgram
  */
 
-#include <string>
 #include <map>
 
-#include "Magnum.h"
 #include "Shader.h"
 
 namespace Magnum {

src/Magnum.h

@@ -15,6 +15,10 @@
     GNU Lesser General Public License version 3 for more details.
 */
 
+/** @file
+ * @brief Basic definitions
+ */
+
 #include <GL/glew.h>
 
 #include "Math/Matrix4.h"

src/Math/Matrix.h

@@ -19,10 +19,7 @@
  * @brief Class Magnum::Math::Matrix
  */
 
-#include <cstring>
-
 #include "Vector.h"
-#include "constants.h"
 
 namespace Magnum { namespace Math {
 

src/Math/Vector4.h

@@ -19,8 +19,6 @@
  * @brief Class Magnum::Math::Vector4
  */
 
-#include "Vector.h"
-
 #include "Vector3.h"
 
 namespace Magnum { namespace Math {