parameterize number of dimensions of vector in tvec<D, T, P>

- specializes for 1, 2, 3 and 4-dimensional vector types
  which are then aliased as tvec1, tvec2, tvec3 and tvec4
- requires C++11 aliases; breaks compatability with C++03
- tested on:
  - clang-3.5.2, clang-3.8.0
  - gcc 4.8.5, gcc 5.4.1, gcc 6.2.0

TODO:
- still uses template template parameters - most can probably be removed
- some definitions might now be de-duplicated

glm/gtc/random.hpp

@@ -44,10 +44,10 @@ namespace glm
 	/// @tparam T Value type. Currently supported: float or double.
 	/// @tparam vecType A vertor type: tvec1, tvec2, tvec3, tvec4 or compatible
 	/// @see gtc_random
-	template <typename T, precision P, template <typename, precision> class vecType>
-	GLM_FUNC_DECL vecType<T, P> linearRand(
-		vecType<T, P> const & Min,
-		vecType<T, P> const & Max);
+	template <int D, typename T, precision P, template <int, typename, precision> class vecType>
+	GLM_FUNC_DECL vecType<D, T, P> linearRand(
+		vecType<D, T, P> const & Min,
+		vecType<D, T, P> const & Max);
 
 	/// Generate random numbers in the interval [Min, Max], according a gaussian distribution 
 	///