Issue #84: Paginate Actions

Addresses #84 
Added generic getPaginationData() function for findAndCountAll results.
Moved .get('/actions') logic to showActions() function.
Extend templateData in showBlocks() and showActions() with paginationData.
Kept `currentPage` declaration/logic in main functions because we use it to determine `offset` in `findAndCountAll()` calls.

Otherwise make a `findAndPaginate()` to wrap the whole `findAndCountAll()` process? At least that was the solution that came to mind first. (pass `req`, `res`, `next`, `model`, `perPage` and `criteria`; calculate `currentPage`; extend passed `criteria` with `limit` and `offset` values; run `model.findAndCountAll` with criteria; pass result to `next`...)

Seems like overkill!