contain cFloat into cppNumber

close vim-jp#46, vim-jp#47

Author: mattn

syntax/cpp.vim

@@ -48,7 +48,7 @@ endif
 if !exists("cpp_no_cpp14")
   syn case ignore
   syn match cppNumber		display "\<0b[01]\('\=[01]\+\)*\(u\=l\{0,2}\|ll\=u\)\>"
-  syn match cppNumber		display "\<[1-9]\('\=\d\+\)*\(u\=l\{0,2}\|ll\=u\)\>"
+  syn match cppNumber		display "\<[1-9]\('\=\d\+\)*\(u\=l\{0,2}\|ll\=u\)\>" contains=cFloat
   syn match cppNumber		display "\<0x\x\('\=\x\+\)*\(u\=l\{0,2}\|ll\=u\)\>"
   syn case match
 endif