Instant login/friend listing.. (use local db, and login in background)

[nripendra]

• save username/password to db.
• Save friend list to db.
• On app startup get the data from db and show friend list directly.
• In background call login if login fails, redirect to login window, else request friend list and update the local copy in ui as well as db.
• If possible work out solution to save cookie also so that login won't actually be required.

[nripendra]

facebook-chat-api now support getAppState() method to support this scenario. May be move this to earlier milestones so that dev cycles would be easy as there won't be need to enter login credentials every time a small piece of code changes

ref: Schmavery/facebook-chat-api#104