moved dideman.dide.util.common to date, common inside dideman.lib module
replaced Date360 with new classes located in lib.date module
updated .gitignore
private teachers app initial commit
changed split of date ranges to include both initial ranges
Update lib/date.py
Update lib/date.py

changed days property at DateRange, to total
Update lib/date.py
private teachers now inherit from dide.Employee
updated lib/dates.py
temp commit
total experience from working periods
added total service
resolved merge conflicts