added module hr_worked_days_from_timesheet
added data serialization for leave activities
removed authors.txt file and corrected indentation
merged worked_days_from_ts
corrected indents
corrected import_worked_days function
Merge branch '7.0-ddufresne-worked_days_from-timesheet' into 7.0-ddufresne-activity_on_timesheet
Corrected error with hour computation
added translation
Merge branch '7.0-ddufresne-worked_days_from-timesheet' into 7.0-ddufresne-activity_on_timesheet
added hourly rates