listen for private messages and respond with private messages where
appropriate
refactor user save; return success indicator
update register command to use private messages, send user error message
on registration failure
enable the embedded raven studio (browse to http://localhost:808X)
create user command and move register/help under it
switch back to context-agnostic SendMessage method name
add aws elb urls command
fix bug when command text ends with spaces
add user login command
add registered users to bot, refactor registration