Missing the function-related commands to the DSG
New functions implemented and data spec generator and merged code with master git repository
addition to the data spec generator
Merge branch 'master' of https://github.com/SpiNNakerManchester/DataSpecification
Merge branch 'master' of https://github.com/SpiNNakerManchester/DataSpecification
Completed the DSG, files now formatted according to PEP8 standard