Aws-creds

- Added the ability to automatically rotate access keys using the `rotate` command.
- Split out functions that use boto3 into creds/util.py

- Updated uninstall script to ensure `.egg` file is removed.
- Updated bug with status which would attempt access key age even when not logged in.
- Updated formatting bugs.

- Migrated all code to a new `Credential` class which includes all application logic.
- Implemented `rm` (profile removal).
- Implemented `update` (profile update).
- Added functionality to migrate from old file version (`accounts.json`) to new directory-based structure.
- Current profile file now stores guid of the current profile.
- All functionality documented.
- README.md updated to reflect new functionality.

- Removed custom code in `ui.py` and `run.py` to support commands.
- Updated `ui.py` and `run.py` to use click API.
- Updated all references to `print()` and `input()` with appropraite click counterparts.
- Updated `README.md` to reflect all changes.
- Removed `version` command.
- Added `--version` option `click.version_option()`.

Alerts if a login has failed due to AWS Environment variables.

This release adds error handling.

The error log is located at ~/.aws/error_log and keeps up to the last 100 errors.

Please attach this error log to any tickets.