Added the Interval library test-suite

[SVN r17239]

status/Jamfile

@@ -20,6 +20,7 @@ subinclude libs/bind/test ;              # test-suite bind
 subinclude libs/filesystem/test ;        # test-suite filesystem
 subinclude libs/format/test ;            # test-suite format
 subinclude libs/function/test ;          # test-suite function
+subinclude libs/numeric/interval/test ;  # test-suite interval
 subinclude libs/optional/test ;          # test-suite optional
 subinclude libs/regex/test ;             # test-suite regex
 subinclude libs/regex/example ;          # test-suite regex-examples