v1.0.0-beta.2

Features

• Added global user roles, role delegation and role based security (#2, d639fa3)
• Added property validations to build-in models (#3, 2b6c2dd)
• Created a validator to enforce foreign key integrity (44cb194)

Bugs

• Changed accessToken from sequential integers to randomly secure guid (f24c3f9)
• Fixed beeing able to change timestamps (1f5e8b4)