remove exec.js, use child_process.execFile

Fixes #3312
fs WriteStream has destroy(), not close()
replace `./lib/utils/sha.js` with `sha`

closes #3381
Docs: fix formatting in folders.md example

In the cycles example, fix structure so that asdf is within bar's
node_modules, rather than directly in bar.

Also tried to make the code-span formatting a bit more consistent
in that section as it was kinda all over the place.
editor@0.0.4
Use editor module
use 'customFds' instead of 'stdio'

For the good of 0.6
child-process-close@0.1.1
Use child-process-close for 0.6 support
slide@1.1.4
node-gyp@0.9.5
minimatch@0.2.12
request@2.20.0
npm-registry-client@0.2.22
npmconf@0.0.24
lockfile@0.3.1
read-package-json@0.4.1
glob@3.2.1
Update all the things!