Added javascript file type to file responder.
Added javascript file type to file responder.

rbevers/fitnesse,jdufner/fitnesse,amolenaar/fitnesse,rbevers/fitnesse,jdufner/fitnesse,amolenaar/fitnesse,hansjoachim/fitnesse,amolenaar/fitnesse,rbevers/fitnesse,jdufner/fitnesse,hansjoachim/fitnesse,hansjoachim/fitnesse