csv handling (issue #31)

This version introduces multiple enhancements:

added methods to handle csv files

Details of additions/deletions below:
--------------------------------------------------------------

Modified:   Base/BlueObject.php
            -- Added --
                $_csvDelimiter
                $_csvEnclosure
                $_csvEscape
                $_csvLineDelimiter
                appendCsv allow to set csv data into object
                returnCsvDelimiter
                returnCsvEnclosure
                returnCsvEscape
                returnCsvLineDelimiter
                changeCsvDelimiter change delimiter for csv row data (give only one character)
                changeCsvEnclosure change enclosure for csv row data (give only one character)
                changeCsvEscape change data escape for csv row data (give only one character)
                changeCsvLineDelimiter change data row delimiter (give only one character)
                toCsv export object as csv data
            -- Updated --
                __construct added handling of scv data