Improve onboarding when using --download-selenium about testium HOT 10 CLOSED

See the full log at: /home/smassa/source/testium/test/integration_log/selenium.log
Error: Unable to find java
  at errnoException (child_process.js:1011:11)
  at Process.ChildProcess._handle.onexit (child_process.js:802:34)

> testium --browser chrome

Preparing chrome...

/Users/justin/code/testdouble/my-project/node_modules/testium/lib/cli/console.js:112
      throw error;
            ^
Error: ENOENT, stat '/Users/justin/code/testdouble/my-project/node_modules/testium/bin/chromedriver'

npm ERR! Darwin 14.1.0
npm ERR! argv "node" "/usr/local/bin/npm" "run" "test-console"
npm ERR! node v0.10.32
npm ERR! npm  v2.1.5
npm ERR! code ELIFECYCLE
npm ERR! [email protected] test-console: `testium --browser chrome`
npm ERR! Exit status 8
npm ERR! 
npm ERR! Failed at the [email protected] test-console script.
npm ERR! This is most likely a problem with the my-project package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     testium --browser chrome
npm ERR! You can get their info via:
npm ERR!     npm owner ls my-project
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /Users/justin/code/testdouble/my-project/npm-debug.log

    "test-console": "./node_modules/.bin/testium --browser chrome"