ENH : move files.py from pyspec
ENH : move files.py from pyspec

Copied verbatim from pyspec

ericdill/databroker,ericdill/fileStore,ericdill/databroker,NSLS-II/filestore,danielballan/filestore,stuwilkins/filestore,ericdill/fileStore,stuwilkins/filestore,tacaswell/filestore,danielballan/filestore