Aio-aws

-------------------
- Update docs with s3-io and s3-aio
- Add non-blocking s3-aio functions
- Add blocking s3-io functions
- Update aiofiles as a required dependency
- Consolidate fixtures into tests.fixtures
- Collect response parsing in aio_aws.utils

-------------------
- Add lambda accessors using response and data properties
- Update docs

-------------------
- Fix read-the-docs builds

-------------------
- Provide s3-client for s3-coroutines
- Update dependencies for boto3, botocore and aiobotocore
- Update docs
- Add readthedocs
- Enable travis deployment for github pages

-------------------
- Revise lambda logging and error handling
- Revise default retries and checks
- Modify aio-aws logger as a function

------------------
- Revise lambda.invoke to return lambda