Update for 2.061

Add !is(Unqual! == enum) to some constraints because
IntegralTypeOf returns true with enum type since 2.061.

Modify some test codes. The cause of following regressions.
- http://d.puremagic.com/issues/show_bug.cgi?id=9169
- http://d.puremagic.com/issues/show_bug.cgi?id=9266
Update .travis.yml for 2.061