Support for space delimited lists and equality assignment

• Parsing now supports space delimited lists, just like csv. For example you can now pass the following list parameter and it will be converted into a bash array. ./myscript.sh -i 123 345 #results in {123,345}
• Assign via equality is possible by using the syntax name=value ./myscript.sh --message=helloworld
• Refactored shArg.sh to smaller, more maintainable functions.
• Moved specs to unit folder and added integration tests and harness.