Allow the MakeMaker test to work when run as "perl -Ilib"

Otherwise "perl Makefile.PL" inside the test can't find the
uninstalled Mite::MakeMaker being tested.

`prove` was setting PERL5LIB and masking the problem.
Add Module::Build support module.

Realize I have to fix the tests for when the mite program is not installed.

For #26
Make it so the MM and MB tests can find mite.

Also ensure that mite can find the Mite libraries.

There's a problem where `mite` is being run with `perl`,
not the perl currently being used to install.  Have to figure that out.