units moved to std::experimental namespace

src/include/units/bits/concepts.h

@@ -24,7 +24,7 @@
 
 #include <units/bits/hacks.h>
 
-namespace units {
+namespace std::experimental::units {
 
   template<typename T>
   concept bool Number = std::Regular<T> &&
@@ -43,4 +43,4 @@ namespace units {
         // …
   } ;
 
-}  // namespace units
+}  // namespace std::experimental::units

src/include/units/bits/downcasting.h

@@ -25,7 +25,7 @@
 #include <units/bits/hacks.h>
 #include <type_traits>
 
-namespace units {
+namespace std::experimental::units {
 
   template<typename BaseType>
   struct downcast_base {
@@ -51,4 +51,4 @@ namespace units {
   template<Downcastable T>
   using downcasting_traits_t = downcasting_traits<T>::type;
 
-}  // namespace units
+}  // namespace std::experimental::units

src/include/units/bits/type_list.h

@@ -24,7 +24,7 @@
 
 #include <units/bits/type_traits.h>
 
-namespace units {
+namespace std::experimental::units {
 
   namespace detail {
 
@@ -182,4 +182,4 @@ namespace units {
   template<TypeList List, template<typename, typename> typename Pred>
   using type_list_sort = detail::type_list_sort_impl<List, Pred>::type;
 
-}  // namespace units
+}  // namespace std::experimental::units

src/include/units/bits/type_traits.h

@@ -24,7 +24,7 @@
 
 #include <type_traits>
 
-namespace units {
+namespace std::experimental::units {
 
   namespace detail {