Clean find command. Refactor handling of GitLab() class.

• Check if NoneType returned from searching abuse reports
• Remove gitlab.admin flag setting in external classes
• Improve get_abuse_report loop and progress bar
• Add label to remove_users progress bar and remove debugging code (oops)
• Clean up the use of admin vs user credentials for login
• Complete restructure of configuration file
• Instantiate GitLab class in Search class (stop passing classes)
• Start implementation of config flag in Utility
• Remove unused Context class from main cli
• Add pytest-cov and coverage requirements