[Web][Database] Adding the user's email to the database.
[Web][Database] Adding the user's email to the database.

Change-Id: I1a026d32b15d4efa58e9e95eab118766ea71d2f7
Bug: 28799391

firebase/quickstart-js,uhntiss/quickstart-js,knohyou/ExRx.net,robforee/YA,DES157/quickstart-js,uhntiss/quickstart-js,theGove/atlas,jmarantz/soccersub,jmarantz/soccersub,robforee/YA,yochannah/trafficuk,jmarantz/soccersub,firebase/quickstart-js,firebase/quickstart-js,DaryaBeda/firebase_,theGove/atlas,DES157/quickstart-js,DaryaBeda/firebase_,yochannah/trafficuk,knohyou/ExRx.net,uhntiss/quickstart-js,robforee/YA