bug where --iterate causes --append to be duplicated for each iteration

[jacobmealey]

The appended items are re-appended every iteration of a --iterate. I found this bug when I was working on #263, but i did more testing on 0.12.

two examples:

$ trurl example.com --append "path=folder" --iterate "scheme=http ssh ftp"
http://example.com/folder
ssh://example.com/folder/folder
ftp://example.com/folder/folder/folder
$ trurl example.com --append "query=foo=bar" --iterate "scheme=http ssh ftp"
http://example.com/?foo=bar
ssh://example.com/?foo=bar&foo=bar
ftp://example.com/?foo=bar&foo=bar&foo=bar

[bagder]

@jacobmealey do you want to work on fixing this or do you want me to have a look?

[jacobmealey]

I'm working on getting the JSON input ready for a PR within the next couple of days, I can take a look once the PR is up and waiting for feedback.

however, if you (or someone else) wants to get this fixed up ASAP then by all means go ahead.

[bagder]

I'll grab it