fixes for the build process

See #8
> `$ rm MANIFEST && perl Makefile.PL && make dist`

Yes, that's because the workflow is

> `perl Makefile.PL && make manifest && make dist`

The only benefit of not deleting 'MANIFEST' is you don't have to call that first when generating a dist.

But people miss that out frequently enough to bust the dist ( Because deleted files stay in the manifest, and new files get missed ), and you must call it prior to `make dist` anyway.