Awsume

- Fixed bug that writes the alias and comment on one line when doing a new install

- Fixed bug that resets environment variables even when you're using the `-h`, `-l`, `-v`, or `-k` (on a different profile than the current profile)

- Fixed list_profiles bug

- Fixed dependency bug

- Ability to start an auto-refresher for role credentials
- One background process will auto-refresh multiple profiles
- Ability to stop auto-refreshing with the `-k` flag
- Will only stop auto-refreshing the profile passed with the `-k` flag
- If no profile passed with `-k` flag, all profiles will stop being auto-refreshed
- When no more profiles are available to be auto-refreshed, the auto-refresher will stop itself
- Check the version of AWSume with `awsume -v`
- Get list of AWSume-able profiles, along with some useful information about each one, with the `-l` option
- Display at the end of running AWSume that lets the user know when their credentials will expire
- Fixed redundant MFA prompt bug
- Replaced the `-n` option with an automatic check for `mfa_serial` in the config profile to determine if MFA is required for that profile

- Fixes a couple of bugs