Add start_index and end_index

[weierophinney]

So you can show : Item [start_index] to [end_index] on [total_items]
or if you prefer : Item 20 to 29 on 100

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Originally posted by @e-belair at zfcampus/zf-hal#169

[weierophinney]

Coverage increased (+0.1%) to 75.4% when pulling 04989a0bc6b6168ceba8a3de1c9e886fa4fa36c7 on manuscle:master into 6f84c05 on zfcampus:master.

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Originally posted by @coveralls at zfcampus/zf-hal#169 (comment)

[weierophinney]

Should such logic not be a front end implementation?
I mean you have all the ingredients to calculate these "start_index" and "end_index" values on the front end side. I consider this interface specific (front-end) and IMO it is not the responsibility of the server to provide these values.

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Originally posted by @Wilt at zfcampus/zf-hal#169 (comment)