Added a debug command
Merge pull request #100 from Tonkpils/debug-command

Added a debug command
Use home dir function from config

user.Current() isn't implemented on all OS/architectures.
Tweak debug handler for unconfigured users
Add os/architecture to user agent
Bump version
Delete 'current' command
Simplify auth
Add missing comments
Add xapi to config

This doesn't use the endpoint yet, but sets it up to be trivial to swap to
Fix bug in xapi host in config
Move demo command into separate handler
Fix completely ridiculous mistake
Actually save demo problems
Make problem stringer work
Improve demo command output
Tweak output of demo handler
Move fetch command into separate handler
Refactor homework
Operate on pointers in homework