Updated property attributes, created models

models for office, dept, instructor, and attributes p.148
MaxLengthOnNames migration timestamp added

moved instruction to ensure the project would  build p.129
Customized data model

Added instructors, dept, office to schoolcontext p.147
Removed transient errors, migrations
Codemaid clean, instructors and courses added
Completed instructor and courses actions

added various view and view model pages p.210