Add "remember me" support

[rdiaztushman]

No description provided.

[ChrisFrench]

I just did this for my own thing in MGX.

But after reviewing it there is several things I think we should do for this in f3-user

each devices cookie should be stored in a collection, so that a user could disable either cookies if they wanted for some reason. That we can store cookies about a user and put lots of useful information about their cookie in that collection, created date, valid date, IP, COUNTRY, Agent

we need to support multiple cookies for one user IE (desktop, laptop, cellphone)

allow user to delete all thier cookies

make a method for displaying EU cookie warning.