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feat(core): zip.select and assorted predicates (#113)

Implements the function

const select: (...arguments) => location => Iterable<locations>

The function is in curried form. It expects a variable arg-set that is used to select/filter starting from the current location.

Each argument can be:
- a 'string' which is interpreted as descending into a property. The property should have an element (or child elements)
- an array of strings which is interpreted as the predicate `ofKind` 
- a function returning a list of locations (selector or motion function)
- a predicate function used to filter out nodes

Also implements the functions that can me used in the `select` function, in some of the following categories:
- selectors
  - `ancestors` an iterable of the location's ancestors; nearest parent first
  - `descendants`, an iterable of all descendants, depth-first, right-to-left
  - `children` an iterable of the location's children
  - `childrenAt(key)` an iterable of the location's children for the specified key
- predicates
  - `ofKind(kind)` a predicate function which will return true if the location points to an element the given kind

Closes #53

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