Ratio: import from Trunk

[SVN r70364]

doc/Jamfile.v2

@@ -32,6 +32,7 @@ boostbook doc
     <dependency>../libs/property_tree/doc//property_tree
     #<dependency>../libs/proto/doc//protodoc.xml
     <dependency>../libs/proto/doc//proto
+    <dependency>../libs/ratio/doc//ratio
     <dependency>../libs/typeof/doc//typeof
     <dependency>../libs/xpressive/doc//autodoc.xml
     <dependency>../libs/xpressive/doc//xpressive
@@ -62,6 +63,7 @@ boostbook doc
     <implicit-dependency>../libs/foreach/doc//foreach
     <implicit-dependency>../libs/property_tree/doc//property_tree
     <implicit-dependency>../libs/proto/doc//proto
+    <implicit-dependency>../libs/ratio/doc//ratio
     <implicit-dependency>../libs/typeof/doc//typeof
     <implicit-dependency>../libs/xpressive/doc//xpressive
     <implicit-dependency>../tools/build/v2/doc//jam_docs