ELAPI Adding file provider and CSV format
    
    This patch creates the infrastructure for
    logging of the event from the top of the interface
    to the bottom. It is a start. A lot of functionality
    is left aside.
    The attempt of this patch is pass event from caller
    of the ELAPI interface via targets to sinks
    then to providers and do serialization creating
    entity that is ready to be written to a file.
    It also implements more specific provider related
    configuration parameters.
    Also it addresses couple suggestions that were
    brought up against previous patch.
    
    ELAPI Correcting issues
    
    This patch addresses the issues found during the
    review of the previous patches and addresses
    ticket #166.