Elaborate on the Makefile to include dialyzer and friends.

This commit situtates dialyzer in the default test path. This will being
annoying as the first app.plt is built, but should be relativly quick
thereafter.

Signed-off-by: Brian L. Troutwine <brian@troutwine.us>
Per conversation, remove dialyzer from the default test path.

Rather than view dialyzer as an essential component of testing, this commit
asserts that it is an essential component of validating the soundness of a
codebase. That is, the code might be wrong but the types look fine!

Signed-off-by: Brian L. Troutwine <brian@troutwine.us>
Merge pull request #1 from blt/elaborate_makefile

Elaborate on the Makefile to include dialyzer and friends.