update Progressive jobboard

This patch updates the Progressive jobboard accordingly to the new rss feed
found on the Progressive Recruitment web site <http://www.\
progressiverecruitment.com/fr/job-search?task=searchAdverts&form-keywords=*\
&form-job-type=2&form-sector=0&form-country=69&form-jobs-salary=0\
&form-order-field=&form-order-dir=DESC&redirect=0&format=feed&type=rss>.

The job location, salary and type (CDI/CDD/...) have vanished.
Merge pull request #4 from yscialom/update-progressive

Update progressive