Fixed lfetool so it runs ltest unit tests.

This addresses issue #103. However, there is still a problem:
 * The tests run fine when lfetool is copied into the project directory and is
   modified to only ever run the unit tests (i.e., comment out the "run" call
   and instead substitute a "only_run_unit_tests" call).
 * The tests do *not* run (Erlang badmatch error) when a project is newly
   created.