Add support for `lower` and `upper` as range options

The use of `start` and `end` as the the range options can be confusing when combined with `reverse` since it swaps the meaning of `start` to being the upper limit and the `end` to being the lower limit. Offering `lower` and `upper` options more explicitly map to the lower and upper limits of range regardless of the `reverse` flag.
We would probably also need corresponding `lowerExclusive` and `upperInclusive` flags for changing default boundary behavior.