add card.js for main.html
add content of viewing the API in README.md
Merge branch 'feature-card-directive' into develop
change the card style and remove user style css, just only use bootstrap
add question count  in card.js
modify meanserviceApp to meanstackApp
Merge branch 'master' of github.com:MEAN-STACK/MEANService into develop
modify controller file name with -
Merge branch 'develop'