multiple smart punctuation fixes

[rwxrob]

Still needs strike but otherwise quotes are golden in headers and elsewhere.

[alerque]

Suggested change

	Run `:PluginInstall` after making the changes from within a `vim` session, or you can just run `vim +':PlugInstall' +':q!' +':q!'` from the command line.
	Run `:PluginInstall` after making the changes and reloading your rc file from within a `vim` session, or you can just run `vim +PlugInstall +UpdateRemotePlugins +all +qa` from the command line.

[alerque]

Can you please revert these changes and drop the image blobs from the commit(s)? For now I think I'd rather leave these out-of-band. One you put screenshots in a plugin they follow the repository around literally forever, and if you update them people start having multiple versions of the images in their repositories. Given that I check out my plugins on all sorts of machines, that starts adding up space and bandwidth for very little gain.

[alerque]

Thanks for taking the time to contribute this @rwxrob. The bulk of the vim stuff looks alright at first pass (although I haven't tested it in action yet), but I have a couple requests in regard to the Readme changes. If you can, I'd like to see the unrelated changes about plugin managers etc. in a separate commit (in case something goes haywire and we have to git bisect or revert). Are you familiar with rebasing? The easiest tool for that job by the way is git revise -c to split at existing commit by hunks.

[rwxrob]

Hope it's okay to just close this request and open a new one #313 with only the changes you suggest. I'm not (yet) acquainted with rebase and revise but will focus on it for next time.

I understand now your reason for not including images. That makes a lot of sense.

There is another bug with relation to ::: divs that I would like to work on later as well. Perhaps I'll submit the report first so we can track it. Thanks again.