WIP: Issue/3 New broken and redirected link rule

[jasonmatos23-git]

Closes #3
Broken and redirected link rule and test added. It uses the same logic as UDOIT 2.8.X to curl links. On detection of either broken or redirected link, the rule sets the anchor as an issue. In the redirected case, the new link ends up saved to the issue metadata.
Tests are for the baseline functions of: Is a non-redirected link detected as an issue (e.g., "https://google.com" not being flagged as redirected because the link changed to "https://www.google.com")? Is a redirected link detected? Is a broken link detected? Do redirected links save the new link to the metadata?

[jasonmatos23-git]

Left to do @bagofarms:

• Consider if there is a way to separate this into two separate rules as is done in UDOIT 2.8.

[AlanFCMV]

I took over from where Cris left off, since he will no longer be working on this. Major changes:

• Refactored to split broken links from redirected links as two separate rules
• Only permanent redirections are considered problematic, as temporary redirects are, well, temporary.
• BrokenLink rule now considers any error code greater than or equal to 400 as a broken link