unmet dependencies on Fedora 21 x64

npm installation quit with some warnings on Fedora
Installation after that worked correctly.

```
$ sudo npm -g install keybase-installer
npm http GET https://registry.npmjs.org/keybase-installer
npm http 200 https://registry.npmjs.org/keybase-installer
npm http GET https://registry.npmjs.org/keybase-installer/-/keybase-installer-1.0.1.tgz
npm http 200 https://registry.npmjs.org/keybase-installer/-/keybase-installer-1.0.1.tgz
/bin/keybase-installer -> /lib/node_modules/keybase-installer/bin/main.js
npm WARN unmet dependency /lib/node_modules/block-stream requires inherits@'~2.0.0' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /lib/node_modules/fstream requires inherits@'~2.0.0' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /lib/node_modules/fstream-ignore requires inherits@'2' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /lib/node_modules/fstream-npm requires inherits@'2' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /lib/node_modules/glob requires inherits@'2' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /lib/node_modules/npmconf requires inherits@'~2.0.0' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
npm WARN unmet dependency /lib/node_modules/tar requires inherits@'2' but will load
npm WARN unmet dependency undefined,
npm WARN unmet dependency which is version undefined
keybase-installer@1.0.1 /lib/node_modules/keybase-installer
$
```

Fedora 21 x64, Linux 3.18.7-200.fc21.x86_64
Node v0.10.33

Start by reproducing the `sudo npm -g install keybase-installer` command on Fedora 21 x64 with Node v0.10.33, using the dependency warnings in the report as the starting point. Determine whether the warnings indicate a real installation problem; done means the dependency behavior is explained or the installation no longer emits the reported warnings.

Written by the indexing model from the issue text.