Initial fixes for bug #85.

Renamed meta_{true|false} to {true|false}_type, meta_if to conditional, is_same_type to is_same, un{ref|pointer|const} to remove_{reference|pointer|const} and makeconst to add_const.
Changed boolean type 'ret' member to 'value'.
Changed 'ret' members refering to types to 'type'.
Adapted all code occurences.

Eigen/src/Core/NumTraits.h

@@ -71,11 +71,11 @@ template<typename T> struct GenericNumTraits
   };
 
   typedef T Real;
-  typedef typename internal::meta_if<
+  typedef typename internal::conditional<
                      IsInteger,
-                     typename internal::meta_if<sizeof(T)<=2, float, double>::ret,
+                     typename internal::conditional<sizeof(T)<=2, float, double>::type,
                      T
-                   >::ret NonInteger;
+                   >::type NonInteger;
   typedef T Nested;
 
   inline static Real epsilon() { return std::numeric_limits<T>::epsilon(); }