Add module install. Plus, document fixture validation at construction.
Bump version number.
Switch to Module::Install.
Bad distname caused Makefile failure.

The failure was this:

    Makefile:530: *** target pattern contains no `%'.  Stop.

It turns out that the distname should have been DBIx-Class-EasyFixture instead
of DBIx::Class::EasyFixture. It might be nice if Module::Install found and
trapped that for us. It fixes it automatically if it reads the name from the
distribution.
Update from POD.
Add Module::Install files to MANIFEST
Remove Build.PL from MANIFEST.