Add "as Model::Id" to Windows#Account and Windows#Job
Validate Vendor/Employee node on Online#TimeActivity
Use Id class for AccountReference account_id
Merge pull request #118 from DexterTheDragon/model_id_as

Add "as Model::Id" to Windows#Account and Windows#Job
Merge pull request #119 from DexterTheDragon/better_time_activity_validations

Validate Vendor/Employee node on Online#TimeActivity