Removes redundant modules app-domain and test-domain

[vbekiaris]

The first commit removes app-domain module, moving its classes to cache-tests module.
The second commit removes test-domain module, its classes & resources moved in cache-tests module.
The third commit removes unused class Zoo.

Fixes #92

[vbekiaris]

@cruftex could you please review?

[cruftex]

That's hard to review in the diff, but looks okay to me. Pls. double check that there are the same number of tests and everything runs through fine.

[vbekiaris]

Both master and this patch yield the same test results:

specific-implementation-tester:
Tests run: 472, Failures: 0, Errors: 0, Skipped: 0

cdi-annotations-tester:
Tests run: 12, Failures: 0, Errors: 0, Skipped: 0

spring-annotations-tester:
Tests run: 12, Failures: 0, Errors: 0, Skipped: 0

guice-annotations-tester:
Tests run: 12, Failures: 0, Errors: 0, Skipped: 0

[cruftex]

Looks good!