新增資料庫連線判斷
fix Test ProductBacklog - Create Story Identify Invalid Value

Conflicts:
	robotTesting/keywords/common_resource.txt
修正 add tag 後端的 bug
fix Test ProductBacklog - Create Story :: Add Story(正常資料)
fix Test ProductBacklog - Create Story With Invalid Value
fix tag compare bug
Test database connection and initialize database when system start
Merge pull request #32 from ezScrum/story_7323

Story 7323