Make various changes to code_schools.yml
Make various changes to code_schools.yml

Typos corrected, Schools added, MakerSquare removed (absorbed by Hack Reactor), and logo paths addded.
Also `has_online` and `online_only` booleans added to each school.

OperationCode/operationcode_backend,OperationCode/operationcode_backend,OperationCode/operationcode_backend,leenyburger/operationcode_backend,leenyburger/operationcode_backend,leenyburger/operationcode_backend