Added a class acting as wrapper to the Yahoo! Finance.

The class handles the CSV Historical API found here:
http://code.google.com/p/yahoo-finance-managed/wiki/csvHistQuotesDownload
All the functionalities are implemented except the
interval which is left to default (daily).
Additional documentation and restricted access to the API.
Changed access for the API class.
Completed the integration for Fairmat.

The YahooFinanceIntegration class provides the interface
to allow Fairmat to do Data Requests to the Market Data Provider.

This Market Data Provider supports only Scalar data request types.
Improved description and names.
Added a description for the service.

Now the class name is not shown anymore in the list of market data
providers but the name of the service.
Expanded the READMEs.
Market was closed the 31 jan 2010 so use 31 jan 2011.
Added unit tests

Added extensive unit tests for YahooFinanceIntegration testing all the classes functions.
Several Style Fixes.
Removed unused references.