Merge pull request #40 from LaunchAcademy/hh-add-extra-oo-challenge

RFR - Add amazon orders OO challenge
Add Max Number exercise.
Remove old challenges.

They've been migrated to the `lessons` folder using the new
challenge format.
Merge pull request #41 from LaunchAcademy/remove_old_challenges

Remove old challenges.
Merge pull request #42 from LaunchAcademy/exercises

Add Max Number exercise.
Add "Task Galaxy" challenge.
Merge pull request #43 from LaunchAcademy/task-galaxy

Add "Task Galaxy" challenge.
remove call to sinatra-reloader method
add rescue mission to horizon
update readme and yml
Merge pull request #44 from LaunchAcademy/vr-rescue-mission

add rescue mission to horizon
Add student grades assignment
Add specs
Remove runner file since added specs