added default channels if no specified channel is given
tested default channel option successfully
changed -c and message argument
added multiuser support at engine level
modified argument style and order
added user info to return
added option for multiple user
tested option for multiple users
tested terminal_ui completely with 100% coverage
Merge branch 'new-design' of github.com:niyaspavil/Broadcaster into new-design
removed unwanted print statement
fix error engine.set_conf
added account info to prompt message
added input types to engine
modified input types to text constants
removed hardcoded plugin dir location
renamed input constants
modified types in prompt in twitter
modified types in prompt in mail
modified types in prompt in ui and added option for multiline input