Bump selenium version

The current version of selenium server stopped working in Firefox 23.  Just updating the baked-in version to one that works with the latest browser.
Merge pull request #9 from aearly/patch-1

Bump selenium version
bump version
Update selenium to 2.39.0
Merge pull request #10 from timonv/master

Update selenium to 2.39.0
selenium v2.39.0
bump nodejs version
Fixed incorrect SHA for the selenium file download

The SHA was incorrect, so the file kept downloading repeatedly. See the SHA here: https://code.google.com/p/selenium/downloads/detail?name=selenium-server-standalone-2.39.0.jar&can=2&q=
Merge pull request #11 from webcast-io/master

Fixed incorrect SHA for the selenium file download
bump to 1.1.9 to fix incorrect sha
Added check for http_proxy environment variable, and if present, use proxy; bumped version to 1.1.10
Merge pull request #12 from geebee/master

Allow use of 'http_proxy' environment variable
fixing merge conflict in package.json