tests: Additional inventory tests for Locations and MovementTypes
Fix #8 and Fix#9: Categories validation, and paging

- Added CRUD test for categories api
- Fix #8 paging now will allow the return of all records
- Fix #9 inventory_account is now checked for on add and edit.
Merge pull request #10 from cambell-prince/feature/Category

feature/category CRUD tests for modules/api/category and other apis