Add index page

With this changes we add the Users page
where all the user are listed

Signed-off-by: oscarsan <oscarsanhueza@gmail.com>
Bug fix, gravatar was not changing size

Before the size of the gravatr was not being
reslly changed as there was not use for the
parameter size on the function

Signed-off-by: oscarsan <oscarsanhueza@gmail.com>
Add rake function to populate database

With this rake function we can populate
the database with multiple users

Signed-off-by: oscarsan <oscarsanhueza@gmail.com>
Add pagination

this use also the factory to make
a list of user in order to test the
pagination, and will_paginate for pa
gination, cool stuff.
reduce pagination to 20 per page


Signed-off-by: oscarsan <oscarsanhueza@gmail.com>