Ignores .tag and .rdf files used for manual testing.
More validation tests.

Signed-off-by: Vlad Velici <vlad.velici@gmail.com>
Extracted Licensing Info validation tests

Signed-off-by: Vlad Velici <vlad.velici@gmail.com>
Add file type constants for spdx2

Signed-off-by: Vlad Velici <vlad.velici@gmail.com>
Validation for all test elements done, close #24

More tests for validation.

Signed-off-by: Vlad Velici <vlad.velici@gmail.com>