Pancloud

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* Added requirements.txt to MANIFEST.in to address build issues with PyPI package.
* Fixed issue in README.rst that prevented PyPI from properly rendering.

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* Updated README.rst
* Updated RTD API Reference.
* Added `pancloud` to requirements_dev.txt
* Added docstrings to `Credentials` property methods.
* Changed logging xpoll() to return entire log entry instead of just `_source` dictionary.
* Added `Credentials` Storage Adapter feature and moved `TinyDB` code to `tinydb_adapter.py`, the default storage adapter.
* Automatically carry `queryId` from `logging --query` response to `--id` in subsequent `--poll`, `--xpoll` and `--delete` in `summit.py`.
* Various bug fixes and improvements to `summit.py`.
* Added support for caching `access_token` in credentials store.
* Added `write()` method to `LoggingService` class to support writing logs.
* Fixed issues with `Credentials` `get_authorization_url` and `fetch_tokens` methods.
* Added `logging_write.py` to examples.

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* Updated logging `xpoll()` to reflect behavior of current API.
* Added `credentials.py` module to support OAuth2 operations.
* Added `auto_refresh` and `auto_retry` support to `HTTPClient()`.
* Added `PartialCredentialsError` exception to handle cases where incomplete credentials are passed to `Credentials`.
* Removed extraneous dependencies, e.g. pyopenssl.
* Cleaned up requirements.txt and PipLock files.
* Added `TinyDB` package for reading/writing `credentials.json` file.
* Now raising `PanCloudError` for `enforce_json` errors.
* Removed logging `poll_all()` method and example script.
* Now checking if `sequence_no` is `None` before incrementing in logging `iter_poll()` method.
* Added event `xpoll()` method to support iterating through events.
* Introducing `summit.py`, a command-line interface for `pancloud`.
* Added `credentials` support to `summit.py` to enable writing `credentials.json` file and passing `Credentials` with requests.
* Updated example scripts library to incorporate new credentials feature.

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* Overhauled and updated RTDs
* Updated `__init__.py` to allow package-level imports
* Fixed issue where starrifying authorization token in `__repr__` overrode value in request header.

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* Updated .gitignore to exclude .pytest_cache
* Excluding certain functions/classes from tests until API Gateway is ready
* Renamed tests modules to all lowercase
* Bumped version to 1.0.2 from 1.0.1
* Updated 'query' and 'poll' endpoints to reflect current working state of APIs
* Fixed .travis.yml branch regex
* Updated example scripts
* Removed pyopenssl property method from HTTPClient
* Removed test_repr() as not all tested python versions support ordered kwargs

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* Default to empty `path`