Make download_links to a global and namespaced config var

[dmasur]

As requested in #1538

The download_links are now configurable as global and namespaced config variable.

With Featuretests and green for major rails versions.

[seanlinsley]

Looks good

[macfanatic]

Do you mind adding a bit of documentation to the doc at the bottom of the file for us?

https://github.com/gregbell/active_admin/blob/master/docs/3-index-pages.md

[dmasur]

Something like that?

[seanlinsley]

Could you squash all those commits together? It's really simple with git rebase -i. Here's some more info.

[macfanatic]

Mention how to disable it globally, like in your cuke, and wrap that last commit into one, & we're good to go.

ie,

git reset --soft HEAD^
# make my last requested change here
git add docs/3-index-pages.md
git commit --amend
git push origin +1538-global-download-links

[dmasur]

Sry I tried it, but get some merge conflicts that i am not able to solve. Can you rebase this for me?
It would be great if you can tell me the steps how to do it.

[macfanatic]

Sure, I'll get this cleaned up & merged in.

[macfanatic]

This has been merged into master.

[seanlinsley]

For posterity, this is the commit: d35f6e9