SRB directory polling, QA and MD proof of concept

The proof of concept workflow which uses SRB directory polling, Quality Assurance testing and Metadata creation has been completed
SRB is set up with three directories: raw, data, rubbish. Raw is used for placing new data, and is the directory that the directory poller watches. when new data is found in the raw directroy, quality assurance and metadata creation is preformed and if all is successful the file is moved to the data directory and metadata is added. If the quality assurance failes the file is moved to the rubbish directory.