date::timespan_string() -- remove 'ago' and don't expect array output

[brettalton]

http://trac.kohanaphp.com/browser/trunk/system/helpers/date.php?rev=2657

First: date::timespan_string() runs date::timespan() and expects it to be an array output, but this is not always the case: http://trac.kohanaphp.com/browser/trunk/system/helpers/date.php?rev=2657#L349

Secondly: date::timespan_string() returns the concatenate string 'ago' to its output. This is incorrect because I have a similar function for my websites and use it to determine time in the future. I also like to use my own terms, such as 'remaining'.

[Shadowhand]

Read the function closer... it does not expect an array of output, it explicitly checks it.

[Shadowhand]

"ago" removed in r2658.