Merge pull request #6 from lilyfan/master

Lily's change on classes and DB in Access
Added: Entry.txt, User.txt
Added: scenarios/edit_entry_source_info.txt
Added: a business rule
Added: info to Entry.txt
Scenarios/Login.txt v3
Added: BR035-037
Scenario/Register.txt v3
Added: BR038-39
Added: 4 class explanation files
Business rule 39: wait time to 48 hours
Added: Entry.txt v2; db_initial_data.txt
Added: a cmn translation
Added a persian entry
Classes: added, modified
DayCareCenters.txt added
Augmented DayCareCenter.txt
Required_data.txt v4; Create_Entry.txt v1; Sub_scenarios.txt v2
Some changes to scenarios and classes
Added blank 'terminology.txt'