Add support for resetting the currentSheet index to 0 upon doClose()

[Cybermonk]

[Cybermonk]

Hello mdeinum,

Have a look @ #14

I think there is one more state variable that needs resetting plus I updated the unit tests.

Kindest regards,
Stavros Lekkas (@codelirium)

[Cybermonk]

Hello @mminella, would that be possible to review and merge #14 ?

[Michael Minella]

Why is doing this via a new instance using step scope not good enough? I ask since that's the way just about every other reader works...

[Cybermonk]

I might sound weird to you but:

1. I thought reusing the same reader adds up to flexibility.
2. I did not want to create a separate reader bean tight to every additional pass I want to make to the excel file - in cases where more than one additional passes are required.

[Michael Minella]

Do you have an example of where this approach is preferred than the step one I'm proposing?

[Cybermonk]

I am afraid I do not. I just felt reusing the reader in the product I rolled out last month.

[Marten Deinum]

Fixed in #65.