added assignment ID as command-line argument: a new directory is now created in `solutions' with the assignment ID as name and the solution source files are moved there before merging
added assignment ID as command-line argument: a new directory is now created in `solutions' with the assignment ID as name and the solution source files are moved there before merging

rgeorgiev583/dsp-practicum-2015-16,rgeorgiev583/dsp-practicum-2015-16,rgeorgiev583/dsp-practicum-2015-16