Add build task to exec jshint

Signed-off-by: Boris HUISGEN <bhuisgen@hbis.fr>
Update README.md

Signed-off-by: Boris HUISGEN <bhuisgen@hbis.fr>
Add .jshintrc default configuration

Signed-off-by: Boris HUISGEN <bhuisgen@hbis.fr>
Fix unused variables

Signed-off-by: Boris HUISGEN <bhuisgen@hbis.fr>
Fix iterate() function name

Signed-off-by: Boris HUISGEN <bhuisgen@hbis.fr>
Update API routes

- app/routes/api/comments.js: fix relations
- app/routes/api/groups.js: fix relations
- app/routes/api/pages.js: fix relations
- app/routes/api/posts.js: fix relations

Signed-off-by: Boris HUISGEN <bhuisgen@hbis.fr>