Browsertime 0.3

• Added frontEndTime (responseEnd & loadEventStart) & backEndTime (navigationStart, responseStart) measurements to make it cleaner when comparing.
• Collect page data (browser version etc.) on first timing run. This reduces the number of times the browser is
  launched, making Browsertime run faster.
• Added -t option to set timeout value when loading urls (default remains 60 seconds).
• Created packages as zip and tar.gz that includes a shell script to run Browsertime, all jars, README, and CHANGELOG.