Done

This is beta version 1.0. I think we have everything we want for the
full points for the lab. Just play around with it and try to find any
bugs till Thursday.

Updates:
- Background services update sql databases
- Background service for daily cleanup of databases
- Clicking on chart opens Yahoo finance for stock
- Updates and notifications restricted to weekdays during market hours
(not done for manual refreshing of data or on startup of app)
- User preferences for data update interval
- Background services restarted when stock added/deleted or update
interval change
- Cleaned up all warnings