Moved set_tmpDir and destroy_tmpDir to util/file.py. Stopped setting sys.path in test_taxon_filter.py.
Added get_project_path, get_build_path, and get_test_path to file.py. Moved get_scripts_path from scripts/__init__.py to file.py. Removed assumption that CWD is project directory.
Merge pull request #6 from broadinstitute/irwin-path-cleanups

Irwin path cleanups