FR-14 Create a page with dashboard and metrics for system administrator

[Shaderock]

Implement:

• see system info: name of app, description, version, java version, the state of application up/down, disk space, uptime, total memory, free memory, nr. of processors, nr. of http server requests
• see the number of all the people ever registered
• see the number of all the cars ever registered
• see the number of all the scans ever happened
• see a graph with daily number of cars entered/exited
• see a pie chart with hours (just hour without minutes) of entering/exiting
• see a pie chart with total rejected vs allowed cars
• see a graph with daily number of rejected/allowed cars
• see a pie chart with cars registered per company