title: npm install -g karma does not install executable
body: <p>I have what looks like successful karma installation, yet karma is not in /usr/local/bin/ and is not found by bash.</p>
  
  <p>Any idea what is wrong and how to fix it?</p>
  
  <p>Here are the end installation messages:</p>
  
  <pre>
  > ws@0.4.31 install /usr/local/lib/node_modules/karma/node_modules/socket.io/node_modules/socket.io-client/node_modules/ws
  > (node-gyp rebuild 2> builderror.log) || (exit 0)
  
    CXX(target) Release/obj.target/bufferutil/src/bufferutil.o
    SOLINK_MODULE(target) Release/bufferutil.node
    SOLINK_MODULE(target) Release/bufferutil.node: Finished
    CXX(target) Release/obj.target/validation/src/validation.o
    SOLINK_MODULE(target) Release/validation.node
    SOLINK_MODULE(target) Release/validation.node: Finished
  karma@0.11.12 /usr/local/lib/node_modules/karma
  ├── di@0.0.1
  ├── graceful-fs@2.0.1
  ├── rimraf@2.2.5
  ├── colors@0.6.2
  ├── mime@1.2.11
  ├── q@0.9.7
  ├── coffee-script@1.6.3
  ├── lodash@2.4.1
  ├── glob@3.2.7 (inherits@2.0.1)
  ├── minimatch@0.2.14 (sigmund@1.0.0, lru-cache@2.5.0)
  ├── optimist@0.6.0 (wordwrap@0.0.2, minimist@0.0.5)
  ├── source-map@0.1.31 (amdefine@0.1.0)
  ├── log4js@0.6.9 (semver@1.1.4, async@0.1.15, readable-stream@1.0.17)
  ├── useragent@2.0.7 (lru-cache@2.2.4)
  ├── http-proxy@0.10.3 (pkginfo@0.2.3, optimist@0.3.7, utile@0.1.7)
  ├── chokidar@0.8.1
  ├── connect@2.12.0 (uid2@0.0.3, methods@0.1.0, pause@0.0.1, cookie-signature@1.0.1, fresh@0.2.0, qs@0.6.6, debug@0.7.4, bytes@0.2.1, raw-body@1.1.2, buffer-crc32@0.2.1, batch@0.5.0, cookie@0.1.0, negotiator@0.3.0, send@0.1.4, multiparty@2.2.0)
  └── socket.io@0.9.16 (base64id@0.1.0, policyfile@0.0.4, redis@0.7.3, socket.io-client@0.9.16)
  
  </pre>