blue objects [0.2.0]

This version introduces multiple enhancements:

changed original data logic, added some new methods, many changes in some methods logic
now object set origin data if created, or if run special method replaceDataArrays

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

Modified:   /BLUE_FRAMEWORK/packages/Blue/blue_object_class.php
            -- Added --
                $_integerKeyPrefix to store value of prefix for integer array keys
                getIntegerKeyString method to get value of $_integerKeyPrefix
                setIntegerKeyString method to set value of $_integerKeyPrefix
                replaceDataArrays to set DATA as original data
                keyDataChanged to retrieve information that data of given key was changed
                traveler universal method to travel in each array in data
                _integerToStringKey to convert integer array keys to string (required to save DATA as xml)
                _skipObject method to replace object by special string
            -- Updated --
                __construct added $indexKeyPrefix attribute to set that prefix at object start
                __call added universal clear method
                getObjectError added default value for key attribute
                clearObjectError changed code convention
                serialize implemented usage of traveler method
                getOriginalData, removed merging data and returning value of DATA
                unsetData removed merging data and usage of _setInOriginData method
                toXml finished method, implemented usage od DOMDocument
                toArray changed code convention
                _appendJson to put data directly to DATA array without usage of setData method, also add data to origin data
                _appendArray, apply add given data to origin data
                _putData removed usage of _setInOriginData method
                _arrayToXml created basic structure to save DATA as xml (for now without attribute handling)
            -- Removed --
                _setInOriginData, because logic of origin data was changed