ds.default.location     Default location to save data
ds.functionality.default
                        Default Functionality
ds.get.url              Load data from URL
ds.getSymbol.yahoo      Get quotes from Yahoo Finance
ds.load.csv             Read csv
ds.storage.database     MongoDB GridFS Storage model
ds.storage.file.csv     CSV file Storage model
ds.storage.file.csv.load
                        Load data from CSV file into 'xts' object
ds.storage.file.csv.save
                        Save 'xts' object into CSV file
ds.storage.file.exists
                        Check if file exists with historical data for
                        given ticker
ds.storage.file.rdata   Rdata file Storage model
ds.storage.file.ticker
                        File with historical data for given ticker
getSymbols              Download historical data
register.data.source    Data Sources
rtsdata                 'rtsdata' - Efficient Data Storage system for R
                        Time Series.
