Storj-HostStats

Invalid date

- added 'node online time'
- added 'last contract sent update time' (Time since the last update of LastContractSent)
- added simple analytics of node parameters. (Example: Warning about a too high time out rate, Missing LastContractSent entry etc. )
- added link to github README which shows a FAQ for the app.
- node stats are now pulled every 30min. (previous was 1h)
- added node loading animation
- fixed wrong calculation of timezone offset
- added missing shadow to 'add node' button