Small pedantic fixes.

src/Math/Matrix4.h

@@ -101,7 +101,7 @@ template<class T> class Matrix4: public Matrix<T, 4> {
 
             T sine = sin(angle);
             T cosine = cos(angle);
-            T oneMinusCosine = 1 - cosine;
+            T oneMinusCosine = T(1) - cosine;
 
             T xx = vn.x()*vn.x();
             T xy = vn.x()*vn.y();
@@ -110,7 +110,7 @@ template<class T> class Matrix4: public Matrix<T, 4> {
             T yz = vn.y()*vn.z();
             T zz = vn.z()*vn.z();
 
-            /* Don't creating identity matrix, as nearly all ones would be
+            /* Not creating identity matrix, as nearly all ones would be
                overwritten */
             Matrix4 out(false);
             out.set(3, 3, T(1));

src/Math/Vector3.h

@@ -27,8 +27,8 @@ namespace Magnum { namespace Math {
 template<class T> class Vector3: public Vector<T, 3> {
     public:
         /** @brief Cross product */
-        static Vector3 cross(const Vector3& a, const Vector3& b) {
-            return Vector3(a[1]*b[2]-a[2]*b[1],
+        static Vector3<T> cross(const Vector3<T>& a, const Vector3<T>& b) {
+            return Vector3<T>(a[1]*b[2]-a[2]*b[1],
                               a[2]*b[0]-a[0]*b[2],
                               a[0]*b[1]-a[1]*b[0]);
         }