Tests at least for #686 which addresses #683

Either @kraih [suggestion](/kraih/mojo/blob/master/lib/Mojo/Server/Morbo.pm#L40) or @tianon's incorporated change pass these tests and the use of a local @INC fiddling is avoided.

As to whether this is an issue @kraih [#686], if we can do the right thing shouldn't we.

Willing to clean this up significantly and remove cruft.