Topic/zip cycle pad

[steventlamb]

Added utilities to support zipping uneven lists, addresses #84

[steventlamb]

modified implementation of -zip for performance, following some of @Fuco1 's suggestions here:
#87

[steventlamb]

I'm happy to make that change.

Right now this PR has a mixture of some features and a performance fix. Does it look like these new features will get merged, or should I break the performance fix out into a new PR and close the new feature PR?

[magnars]

I like these functions, so I'm happy to merge both in one pull request. :-)

[steventlamb]

OK, updated to use (-none? 'null lists)

[magnars]

It would be nice to have the changes to -zip be reflected with a few examples. And does it warrant an addendum to the docstring?

@Fuco1: I see that you had some comments on the other thread. Have your concerns been abated?

[Fuco1]

This should be indented.

[Fuco1]

I had a dilemma about returning a list vs dotted list, but after I've tried working a bit with dotted lists, they are utterly impossible... so I think lists are better after all.

I guess all issues had been addressed, I've put two more minor comments on the commits, when that is fixed, I guess it's OK to merge.

[magnars]

Let me know when you've looked at the last minor issues, @steventlamb :-)

[steventlamb]

@magnars You suggested adding examples for n-ary -zip, some were added in this commit that has already been merged: 703bb59
Is that sufficient?

[steventlamb]

@magnars @Fuco1 Updated to drop unused count var and fix indentation.

[magnars]

Thanks :-)

[magnars]

@steventlamb

Hi Steve!

I'd like to include dash.el into GNU ELPA, but for that we need all
significant contributors to sign some copyright paperwork (same as for
Emacs, to ease up moving code between the two).

You're one of the contributors to dash.el so we'd need you to sign
that paperwork. Would you be willing to do that?

[steventlamb]

Gladly. How do we go forward? Are you able to retrieve my email address from the commit logs?

[Fuco1]

Hi Steve.

Gladly. How do we go forward? Are you able to retrieve my email
address from the commit logs?

See the following instructions I got from Stefan (the Emacs maintainer):

Please email the following information to assign@gnu.org, and we
will send you the assignment form for your past and future changes.

Please use your full legal name (in ASCII characters) as the subject

line of the message.

REQUEST: SEND FORM FOR PAST AND FUTURE CHANGES

[What is the name of the program or package you're contributing to?]
Emacs

[Did you copy any files or text written by someone else in these changes?
Even if that material is free software, we need to know about it.]

[Do you have an employer who might have a basis to claim to own
your changes? Do you attend a school which might make such a claim?]

[For the copyright registration, what country are you a citizen of?]

[What year were you born?]

[Please write your email address here.]

[Please write your postal address here.]

[Which files have you changed so far, and which new files have you written
so far?]

Best regards,
Matúš Goljer

[steventlamb]

@Fuco1 Thanks, I have sent this info over.