Reorganise service library and fix warnings
Refactor repo signatures

Expose IQueryables from repos rather than lists.
Combine the open and create methods of the grade boundaries repo.
Remove concept of registers
Introduce more immutability in models
Remove all register pages and links
More immutability and small view tweaks
More tweaks to assessment create view

Removed subject input for now until I can implement full tagging
Add Kendo UI resources
Refactor the assessments index to use whole screen