Fixed null brandnames
Added observable versions of all models
Added MVVM light viewmodel and container
added dev inventory view
Converted over to MVVM light
Added MVVM light viewmodel and container
added MVVM light to testing project
Tweaks to dev inventory
Removed ref to Converter, moved Locator
Spaced out code for readability
Removed old command classes
Renamed MainViewModel to InventoryViewModel
Added TransactionViewModel
Renamed Datacontext to work with rename
Added transaction dev view
Gutted old project
Merge mvvm-refactor into sprint-2