Persistence interface for StockPortfolio project.
Implementation of PersistSymbol interface.
Merge pull request #4 from ivolynkin/master

Improved ScrapStockData
Merge pull request #5 from ivolynkin/master

working YahooFinanceConnection
Update with fixes and error checking when reading and creating symbols.
Checkins of junits for persistence.
first interface defined with team
Merge remote-tracking branch 'origin/master'
Merge pull request #6 from cmiyachi/zyyang

Zyyang