Support for passing DNANucleotide and RNANucleotide

v0.0.2

Fixed nothing test

First release

With this very first release of BioArgParse, it is possible to conveniently have ArgParse create BioSequence's from command line options, by specifying your desired specific BioSequence type e.g. BioSequence{DNAAlphabet{4}} as the arg_type in your ArgParse argument table.