[cli-email] added to dispatch
[cli-email] interface
[cli-email] basic functionality
[cli-email] added verbose option
[cli-email] added bcc option
[cli-email] added directory option
[cli-email] added subject option
[cli-email] checks if utility 'mutt' is installed
[cli-email] synced with origin
[cli-email] formatting the whitespace
Merge pull request #70 from cs3110/cli-email

Port email command to core