Update links in README, a few 301, GitHub repos all on SSL [ci skip]
Adding a missing test for #291

You already had this fixed, though you didn't have a test that covered
it in options
Merge pull request #322 from randomecho/copyedit-readme

Update links in README
update note about default stylesheet
Merge pull request #325 from LightGuard/issue_291

Adding a missing test for #291
add guard test dependencies and configuration
add Guardfile and deps for continuous testing

- leave dependency group commented by default
- add instructions for disabling notifications
Fixes #320

I had to make one test change which was expecting an invalid backend,
which no longer happens with this change, modified it to use -d instead.

Also changed the text for -b in options.
Updating the man page to reflect the change to -b
Merge pull request #331 from LightGuard/issue_320

Fixes Issue 320