Add argparse to requirements in setup.py
Rename ucare.list, get_args, add UcareListTest
Rename ucare.get, add UcareGetTest
Rename ucare.store, add UcareStoreTest
Rename ucare.delete, add UcareDeleteTest
Rename ucare file functions
Merge pull request #39 from uploadcare/ucare-fixes

Ucare fixes and tests