Add script testing for format script

Add test files and update script usage for format_tree_and_trait_table.py.
Partially addresses #97
Add script testing for asr script

Add test files and update script usage for ancestral_state_reconstruction.py
Partially addresses #97
Add script testing for predict_traits.py script

Add test files and add script usage for predict_traits.py
Fixes #95
Partially addresses #97
Add script testing for compare_biom.py

Add test cases and update script usage for compare_biom.py
Partially addresses #97
Merge pull request #105 from mlangill/script_testing

Add testing for several scripts