Isilon-sdk

Updated language bindings for the latest OneFS maintenance releases and resolved issue 68.

This release resolves issue https://github.com/Isilon/isilon_sdk/issues/39 by providing language bindings for the RAN (i.e. RESTful Access to Namespace) interface. Examples have been provided for usage of the new `NamespaceApi` class, which is available for [access points](https://github.com/Isilon/isilon_sdk/blob/master/tests/test_access_points.py), [files](https://github.com/Isilon/isilon_sdk/blob/master/tests/test_namespace_files.py), and [directories](https://github.com/Isilon/isilon_sdk/blob/master/tests/test_namespace_directories.py).

Introduces `isi_sdk_8_1_1` for OneFS 8.1.1 support.

This release resolves a number of PAPI schemas and updates the documentation.

This release improves the SDK on a number of fronts:

- Support for Swagger Codegen [v2.3.1](https://github.com/swagger-api/swagger-codegen/releases/tag/v2.3.1)
- Replaces basic auth with session auth, which includes support for CSRF tokens
- Resolves issues 8, 9, 10, 11, 12, 13, 14, 15, 22, and 26.
- Introduces configurable logging instead of `print` statements
- Adds properties `maxLength`, `minLength` and `pattern` to the Swagger config
- Handling on invalid PAPI describe schemas
- Linting with `pylint` and `pep8`

Introduces `isi_sdk_8_1_0` for OneFS 8.1.0 support.