repository creation
first naive implementation of a small hierarchy of stocks data source readers (StockReader, CsvStockReader, JsonStockReader, WebStockReader)

important aspects:
. the hierarchy is thought to be used as some sort of Dependency Injection principle
. the only stock reader implemented so far is the CsvStockReader
. the naive implementation hasn't been tested but it should load de .csv data
. the amount of 'business intelligence' from the loaded data is minimal so far (it should be implemented in the future)
performed my first code refactoring like a very tiny development cicle

basically realised that it would be better if every StockReader handled only the part of processing the data source (a .csv file, a .json file, a remote web service, etc.) and the rest of information processing (extracting title, dates, facts, etc.) should be handled by a whole StockData hierarchy. After that, a Dependency Injection like design could be applied.
implemented the 'stock data' class hierarchy in order to cope with the different types of 'stock data'

for now, i'm only coping with 'weekly stock data' because that is the only example i have. however the class hierarchy is designed to cope with 'daily stock data', 'monthly stock data' and it's open to extension to other kinds of 'stock data'.
Merge ../../stock-data-model