changed file processing interface; added support for relative file paths (with respect to daq directory)

add first functional DS web service with user, experiment and auth controllers that allow retrieving user and experiment information from the db, start/stop experiment, and principal authorization; added corresponding API and CLI classes; added storage manager skeleton

add first functional daq web service with experiment controller, functionality to observe file system and invoke file transfers; add initial API and CLI classes for start/stop daq, upload data;

moved common authorization/authentication classes into their own module to better reflect their functionality; added checks for admin role name into principal retrievers