Should be able to choose whether webdriver errors immediate quit or not

[juliemr]

Currently, an error from webdriver (such as an element not found) immediately exits and prints the stack trace, and does not quit the driver. This is useful when in-depth debugging one test, but not very nice if you just want to run the entire suite and see your failures. There should be an option to just have errors turn into failures.

[juliemr]

ab8d6a5 shows a way to do this in tests. It adds a line to every spec and is not ideal, but is a simple fix for now. Should consider a better way to do this in the future.