SSL Certificate Checking and Grammar Fixes

[dandalton1]

• Changed word spacing in bin/http-server to have aligned tabs
• Removed double negative in SSL argument parsing (that is, removal of !!)
• SSL attempts to stat SSL certificate and then SSL private key; this is made in case one is not supplied
• Changed null-checking for cache control to also account for null, in case null is supplied
• Removed a Node linting error where true should be a Boolean instead of a String
• Prettier grammar on test script

Fixes #135

[dandalton1]

Yes, I can change the wording and re-submit the pull request if you need me to, or do it in a different PR.

[thornjad]

No need to submit a new request, you can just make the changes here! There are a few merge conflicts as well, so you'll want to merge master.

[dandalton1]

Fixed merge conflicts and wording.

[dandalton1]

Meant to update README to be tabular in a separate pull request. Eh, lemme know what you think

[thornjad]

Yeah the readme changes are significant and separate from the cert/key checking, so that should be its own PR

[dandalton1]

Sorry about that! I undid those changes, I'm still getting used to Git honestly. Should've honestly made a new branch on my end for it

[thornjad]

No problem!

[thornjad]

I squashed because of the revert commits; better to have that all together. Thanks @dandalton1!