Don't use `get` method
Separate report page
Show reports of project on today

fix #416
Show reports of project on this week

fix #417
Paginate week tabs

fix #418
Merge pull request #425 from kmiyake/show_workers_time_entry_on_report_page

Show workers time entry on report page
Fix workload process

acts_as_time_trackableの処理を参考にWorkloadの処理をリファクタリング
する。
Remove dead code