Make limitBy usable with decimal ranges

[Nfinished]

The v-for directive can take a range to iterate through, like v-for="i in 10". This pull request allows limitBy to work with ranges by creating a 1-indexed array (as does the spec) to iterate through.

https://vuejs.org/v2/guide/list.html#v-for-with-a-Range

[freearhey]

Could you give at least one scenario of using this feature? Right now I don’t understand why you can’t just change the number in the "v-for" directive to something else.

[Nfinished]

It's super useful in creating pagination elements without muddying your computed properties.

[freearhey]

Alright, I'll check everything and try to add this to the next update.