Merge pull request #1 from aguibert/master

Relational database code + example
Jon loves men
Merge pull request #2 from aguibert/master

Rename "Package" to "SystemPackage"
Merge pull request #3 from aguibert/master

Iteration 1
Truck and Truck Manager

The route methods have been left blank I also have an error because we
need a new method in the database for getting trucks by their state
Merge pull request #4 from aguibert/master

New db method for getting trucks in certain state
Fixed problems in Truck and Truck Manager

Problems that were mentioned by Andy on Github
Synced code with Design Documents
Fixed null check and return in Truck
Merge pull request #2 from lrohret/master

Truck and Truck Manager