[feature-mode] Feature mode supports Cucumber/Gherkins

I got it from the package manager, but I think the source is here:

https://github.com/michaelklishin/cucumber.el
[puppet-mode] puppet!
[ruby] Basic Ruby Setup from Emacs Starter Kit
[projectile] Basic setup for Projectile
[packages] Stop trying to install packages automatically

When I upgraded to 24.3 this piece of elisp that is supposed to
"install all packages that you call out if they aren't there" started
failing.

I never used this thing, anyway.

Yet, it seems like a good idea to track which packages you care about.

Hmm.. I'll go add three more packages I care about and delete this
commented out code.
[packages] Give up idea of auto-installing packages I care about