Added chrome.storage / additional login events / reactiveQuery sort, skip, limit options

1. Chrome storage: see previous PR
2. Additional login events: 
    - loginAttempt: once a login attempt starts
    - loginNull: if the user is actually not logged in
3. ReactiveQuery options:
    - sort : works with a single attribute only for now (can be a nested attribute)
    - skip : ok
    - limit : ok