Allow prepending javaArgs via an environment variable.
Allow prepending javaArgs via an environment variable.

This is so we can add -Xmx400m in fallbacks.  For some reason,
Lantern won't start if we add that after the -jar argument.

lqch14102/lantern,getlantern/lantern-java,lqch14102/lantern,getlantern/lantern-java,getlantern/lantern-java,lqch14102/lantern,getlantern/lantern-java,lqch14102/lantern,lqch14102/lantern,lqch14102/lantern,getlantern/lantern-java,getlantern/lantern-java,lqch14102/lantern,getlantern/lantern-java,lqch14102/lantern,getlantern/lantern-java,lqch14102/lantern,getlantern/lantern-java