v7: wax. move db init inside main method

Avoid error:

   (sql: database is closed)

v6: Fix chart data show (#63)

* sun-ui. Created sessions and new users chart
* sun-ui. Fixed chart display, and added i18n
* sun-ui. Implemented details report chart for User and Session
* sun-ui. Fixed detail charts display
* sun-ui. Implemented duration average chart, for user and session
* sun-ui. Fixed grahpic and refactor on Report page
* sun-ui. Fixed yAxis display value on charts
* sun-ui. Created Average table for users and connection
* sun-ui. Created current situation chart
* sun-ui. Made cosmetic changes
* sun-ui. Order sections on Report page
* sun-ui. Fix new user and total traffic chart
* sun-ui. Modified user chart data show
* sun-ui. Modified duration chart data show
* sun-ui. Refactored code for ReportStatistics

v5: Merge pull request #64 from gsanchietti/db-refactor

Correctly handle db connections

v4

sun-ui. fix date from and to in session view

v3

sun-ui. hide results count if no values

v2: deploy. improve tls management in icaro role

Add icaro.tls config, with values:

* "self_signed": a self signed https certificate will be generate by
caddy
* "manual": the certifcate must provided by the admin:
  - certificate file: /opt/icaro/{$ICARO_HOSTNAME}_cert.pem
  - private key file: /opt/icaro/{$ICARO_HOSTNAME}_private_key.pem
* "auto" or any other values: the certifcate will be generate by caddy
via Let's encypt.

v1

deploy. improve sun-ui assets management

rc4

deploy. add custom tos and marketing use

rc3

sun-ui. added support for all images type

rc2

deploy. add support for captive portal configs