Keybase update breaks if not root

Ok so I know I should run `keybase update` as **root**. However, today, I forgot to do that and ran it as my own user. Keybase broke itself in this process.
cedwardsmedia@Thunderbird:~ 03:45 PM > keybase update

``` bash
info: Attempting software upgrade.....
info: Made temporary directory: /var/folders/wk/fvft4cnj099cn083w2tydsdr0000gx/T/keybase_install_IhDBWl5MVnD5Khflc9zucQ
info: Using keyset version v1
info: Fetching URL https://dist.keybase.io/sig/files/1/index.asc
info: Fetching URL https://dist.keybase.io/pkg/stable
info: Fetching URL https://dist.keybase.io/sig/files/1/keybase-0.4.7.tgz.asc
info: verified signature of keybase-0.4.7.tgz against keybase-0.4.7.tgz.asc
info: Running npm install keybase-0.4.7.tgz: this may take a minute, please be patient
npm ERR! error rolling back Error: EACCES, unlink '/usr/local/lib/node_modules/keybase'
npm ERR! error rolling back keybase@0.4.7 { [Error: EACCES, unlink '/usr/local/lib/node_modules/keybase']
npm ERR! error rolling back errno: 3,
npm ERR! error rolling back code: 'EACCES',
npm ERR! error rolling back path: '/usr/local/lib/node_modules/keybase' }
npm ERR! Error: EACCES, unlink '/usr/local/lib/node_modules/keybase'
npm ERR! { [Error: EACCES, unlink '/usr/local/lib/node_modules/keybase']
npm ERR! errno: 3,
npm ERR! code: 'EACCES',
npm ERR! path: '/usr/local/lib/node_modules/keybase' }
npm ERR!
npm ERR! Please try running this command again as root/Administrator.

npm ERR! System Darwin 13.2.0
npm ERR! command "node" "/usr/local/bin/npm" "install" "-g" "/var/folders/wk/fvft4cnj099cn083w2tydsdr0000gx/T/keybase_install_IhDBWl5MVnD5Khflc9zucQ/keybase-0.4.7.tgz"
npm ERR! cwd /Users/cedwardsmedia
npm ERR! node -v v0.10.28
npm ERR! npm -v 1.4.9
npm ERR! path /usr/local/lib/node_modules/keybase
npm ERR! code EACCES
npm ERR! errno 3
npm ERR! stack Error: EACCES, unlink '/usr/local/lib/node_modules/keybase'
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR! /Users/cedwardsmedia/npm-debug.log
npm ERR! not ok code 0
info: cleaning up tmpdir /var/folders/wk/fvft4cnj099cn083w2tydsdr0000gx/T/keybase_install_IhDBWl5MVnD5Khflc9zucQ
error: exit code 3
error: exit code 254
cedwardsmedia@Thunderbird:~ 03:45 PM > sudo keybase update
Password:
sudo: keybase: command not found
cedwardsmedia@Thunderbird:~ 03:46 PM > whereis keybase
cedwardsmedia@Thunderbird:~ 03:46 PM > keybase update
-bash: /usr/local/bin/keybase: No such file or directory
```

I ultimately had to run keybase from the full path `/usr/local/lib/node_modules/keybase/bin/main.js`. Once I did this, it updated and recreated the symlink(s). While this is a minor bug, it's one that would likely deter most folks from using Keybase on a large scale.
##### Note

I have little experience with Node.js and `npm` so this may be an issue caused by npm rather than Keybase. Either way, I think Keybase devs should be aware of this issue.

Reproduce the failed `keybase update` as a non-root user using the reported npm and Node.js environment, then inspect the update entry point reached through `/usr/local/lib/node_modules/keybase/bin/main.js`. Compare the broken `/usr/local/bin/keybase` state with the successful full-path update and verify that the command remains available after an unprivileged attempt.

Written by the indexing model from the issue text.