Code needs to be cleaned up

[nothingnesses]

Current

1. The code uses a lot of unwrap and expect and unchecked_into.
2. There are a lot of hard-coded values such as URLs and login credentials.

Wanted

1. Use proper error-handling and log messages to console. Look into error-handling libraries.
2. These should be stored in configuration files, outside of VCS.

[nothingnesses]

Addressed by #66 and #68.