adding JSErrorCollector support
added tests to CheckingVisibilityWithThefluentElementAPI
Integrated support for javascript error reporting - doesn't seem to be supported by the Firefox driver properly, though
Update pom.xml

Selenium version update to 2.33.0; fixing issue where java script error is not being detected
Merge branch 'javascript-error-handling' of https://github.com/johw12/thucydides

Conflicts:
	pom.xml