Test files will be housed within their respective modules
therefore we need to run test files with a filename using
the following convention *.test.*

The Maybe data type has been refactored into a separate module, with the
addition of the Maybe, Just and Nothing interfaces to help type
parameters in chaining methods and result types.

Add tests that cover the use of chaining a container i.e. monad, such as
a Maybe and an Either. The Either tests have been disabled until the
Either data type has been refactored into its own module and its types
have been refactored to support the correct parameter types when chaining
against its "contained" value.