Add default rake task in root
Update readme
Tweak readme
Add bottles exercise
Add checkerboard exercise
Add food chain exercise
Add house exercise
Add rake to the gem file
Clean up house exercise
Clean up bottles exercise
Update checkerboard instructions
Use the same minitest version in bottles
Fix minitest inconsistency in house
Clean up food chain exercise
Update install instructions
Don't use pride - it doesn't work on Windows
Don't use pride - it doesn't work on Windows
Don't use pride - it doesn't work on Windows
Don't use pride - it doesn't work on Windows
Tweak branching instructions