BeanshellTest: add missing testLocals test
ClojureTest: add bindings clear check to testLocal

Specifically, clearing the bindings is unsupported with the
ClojureScriptEngine; the test is mostly there just to document that.
Otherwise, comparing the testLocal method with that of other engines
leaves one wondering why we do not test the clear() method for Clojure.
BeanshellTest: clean up style
ClojureTest: clean up style
JavaScriptTest: clean up style
JRubyTest: clean up style
JythonTest: clean up style
MersenneTwisterFast: suppress all warnings

This class was taken verbatim from an existing implementation. See:
http://cs.gmu.edu/~sean/research/mersenne/MersenneTwisterFast.java

As such, rather than make substantial changes and thereby forking the
code, let's just make the compiler shut up about warnings. That way,
should we wish to upgrade to a newer version in the future, we won't
have to worry about redoing any work.
WIP: TEMP

Need to test with new SJC, if it works then release scijava-common,
then bump ImageJ2 master, then merge latest master again.

Finally, after all that, the JS test changes here will work!