Update getText() to support FF

innerText doesn't work on FF, and textContent is the closest thing.
https://developer.mozilla.org/en-US/docs/Web/API/Node.textContent
Merge pull request #4 from zerious/master

Merged execute change, and fixed exam dependency
Update getText to support IE<=8 and FF
Merge pull request #2 from arthurkam/patch-1

Update getText() to support FF
Propagating textContent change