Merge pull request #12 from AndyYou/master

Add visual code for merge data
Merge pull request #13 from AndyYou/master

Add DbHelper ExecuteSqlBulk()
Modify CheckVersion method to return integer value
Merge branch 'master' of github.com:CalvertYang/NDBackuper
Merge pull request #14 from AndyYou/master

fixed copy database bug
UpgradeDatabase method not finished
Merge branch 'master' of github.com:CalvertYang/NDBackuper
UpgradeDatabase method not finished
Merge pull request #15 from AndyYou/master

Add CopyDatabase Method
Merge branch 'master' of github.com:CalvertYang/NDBackuper
Merge pull request #6 from CalvertYang/master

Merge code