Schedule a job to schedule all PyBossa jobs.
Fix code health.
Refactor.
Fix.
Refactor.

Basically create 4 scheduled jobs that will be run every:
 - 10 minutes
 - 1 hour
 - 12 hours
 - 24 hours

This jobs will be the only ones that are enqueued automatically by
rq-scheduler, and they will enqueue via python-rq the jobs to be run.
Get user stats.
Fix PEP8
Cache users in leaderboard.
Return all jobs.
fix vagrant and docs
fix order for rq-worker
fix missing scheduled_jobs
Merge pull request #992 from PyBossa/issue-schedule-job

Schedule a job to schedule all PyBossa jobs.