Merge pull request #3 from ikrav/egm_electron_id_development

This pull request is for the set of changes including:

    added producer for 5x5 quantities from Ming
    added new cut definition for full 5x5 sigmaIEtaIEta
    added 4 working points for CSA14 Scenario 1 and Scenario 2
    a few other related changes
Merged common_isolation_selection_70X from repository lgray
Changed missing hits accessor to numberOfLostHits() to take into account known detector failures