[feature]populate data for "my cards" page

Note: there are still some unknown data to be determined
[feature]add tests for albums_controller, only logged in user can access
[chore]add imgs for album actions
[chore]make image url work for assert pipeline with image-url
[chore]add link to card show page
[feature]working on the card show page
[feature]user can like an image

Note: a problem: what if a user click many times for the like?
[test]add tests for images_controller
[chore]set album's hidden value to false
[feature]TDD for POST hide_card
[chore]use `must_be` for boolean assertation
[chore]user can hide album
[chore]only show non-hidden cards for card index page
[feature]after user hide a card, remove the element
[chore]fix bug that can not assign creator when creating new card
Merge pull request #16 from peterzd/card_pages

Card pages