Add our current destdir to @*INC

This fixes the issue with LibraryMake and OpenSSL/Auth::PAM::Simple/etc
(if LibraryMake was installed as a dependency of the above, the build
would fail the first time, but not the second)
Merge pull request #94 from hoelzro/master

Add basic schema support
Make README more correct, fixes #88
Merge pull request #90 from retupmoca/master

Add our current destdir to @*INC
call Build.pm's test method if possible
Merge pull request #97 from FROGGS/test

call Build.pm's test method if possible
Force source-url into a Str

Because sometimes it's an IO::Path