Disable unused local variable warning in Eclipse.

The latest version of Elipse claims ther are over 100 unread local variables in our code base, 0 of them appear to be accurate.  Since the warning is now useless, we should ignore it.
Compeltely disable Eclipse JavaScript semantic validation in favor of JSHint.
Merge pull request #1212 from AnalyticalGraphicsInc/shut-up-eclipse

Disable unused local variable warning in Eclipse.