Added test "CanSplitLineUsingDynamicWordDelimiter"
Added new constructor to supply word delimiter character
Implemented new private method "isNotDelimiter". Changed "splitLine" to
use "isNotDelimiter" instead of "isNotSpace".
Implemented new test "ConcatenateWordsUsingDynamicWordDelimiter"
Added new constructors to set dynamic word delimiter
Change method "addWordToLine" to use dynamic delimiter instead of
hardcoded space
Modified tests and implementations so that dynamic word delimiter is set
using method call instead of via constructor
Added abstract interfaces for LineToWords and WordsToLine
Started to modify WordsrepClass to allow dependency injection for
LineToWordsClass and WordsToLineClass. But I must start with test first!