Step 7

* Added testParseCustomDelimiter2Chars - Tests that numbers separated
with a custom delimiter parses correctly. that validates "//[**]\n1**2".
* During refactoring noticed error with String.split on a ** so renamed
that testParseCustomDelimiter2SpecialChars - Tests that numbers
separated with a custom delimiter containing special characters parses
correctly.
* Recreated testParseCustomDelimiter2Chars - Tests that numbers
separated with a custom delimiter parses correctly. that validates
"//[;;]\n1;;2".
* Amended regex and refactored to create a parseNumber method.