index.js
function removeEmailFromAllBooks(callback, email){
    if ((email===undefined)||(!email.length)){
        return callback(returnError('Empty email'));
    }
    sendRequest( 'emails/' + email, 'DELETE', {}, true, callback );
}
function removeEmailFromAllBooks(callback, email){
    if ((email===undefined)||(!email.length)){
        return callback(returnError('Empty email'));
    }
    sendRequest( 'emails/' + email, 'DELETE', {}, true, callback );
}
Remove email from all books

@param callback
@param email