Updated Selenium server and Chrome driver to latest versions

The update brings v2.39.0 of Selenium's standalone server and
ChromeDriver version 4 (Mac version only, as before).
Updated Jasmine to final v2.0.0

Angela was using v2.0.0rc5. Final v2.0.0 version has just been
released:
  http://pivotallabs.com/jasmine-2-release/
Added mention of trycatch library to README
Bumped version to v1.2.0