Awsume

- Fixes issue where awsuming with command prompt would not set environment variables

- Adds two new command-line options: `--info` and `--debug`, both used for logging purposes.
- `--info` will list only basic information about each step in the AWSume process
- `--debug` will list detailed information about what is happening during AWSume's runtime. It will definitely spam your screen if you don't direct it's output elsewhere: most commonly `awsume --debug 2> logs.txt`

- Fixed bug in which running `awsume -l` would crash for Python 3 users

- Fixed issues around Python 3 compatibility. All features should be compatible with both Python 2 and 3
- Fixed edge case in which there is an auto-refresh role profile in the user's credentials file that the user no longer has permission to assume

- Fixed logging issue with the plugin manager

- Adds new plugin system, built on the Yapsy plugin manager. Full documentation on the plugin system can be read [here](https://github.com/trek10inc/awsume/blob/master/PluginDocumentation.md)