[Proposal] Introduce `last` and `init` functions to Kernel

[Weslei Juan Novaes Pereira]

As Elixir has the `hd` and `tl` functions, it'd be very useful to have a `init` and `last` functions as well. For example:

last: takes a list and returns its last element.

iex> last [5,4,3,2,1]

1

init: takes a list and returns everything except its last element.

iex> init [5,4,3,2,1]

[5,4,3,2]

[eksperimental]

We already have List.last/1-2

[José Valim]

The only reason why hd and tl are in Kernel is because they are allowed in guards. Currently there are no plans of adding more functions like them in Kernel.

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