Add intro, remove tutorial and docs
Merge pull request #38 from uploadcare/new-readme

New README
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
Merge branch 'master' into file-group

Fix MockResponse importing