Reflow all the language stack `README-content.md` files to 80 columns and incorporate Fred's changes

This also includes Fred's updates to the `README-short.txt` files, and a bunch of very minor changes for consistency (using "PHP" instead of "php", ending sentences that describe and lead into a code block with a ":", using "Go" instead of "Golang" and "Hy" instead of "Hylang" within prose, not using periods at the end of headlines, etc).

A really fun one included here is that Java mentioned both using GNU Make inside the container (and `java` doesn't include `make` presently), and some of the prose mentioned `go build` after we ran `javac`, which was extra neat.
Merge pull request #22 from infosiftr/consistency-and-fredlf

Reflow all the language stack `README-content.md` files to 80 columns and incorporate Fred's changes
Run ./update.sh
Change "./update.sh" to be template-based instead of footer-based

This makes it slightly easier to manage and work with (especially if we want to change the order of things in the future).
Merge pull request #23 from infosiftr/template

Change "./update.sh" to be template-based instead of footer-based
Remove some unnecessary (and unimportant) extra whitespace from the "redis" README
Update "Tags" section to be labelled "Supported tags" instead, to make it clear that this isn't the full list of tags, but is instead the list of tags that are currently supported for active usage
Merge pull request #26 from infosiftr/supported

Update "Tags" section to be labelled "Supported tags" instead, to make it clear that this isn't the full list of tags, but is instead the list of tags that are currently supported for active usage