added check for java 7 compilation on installer verification class
added check for java 7 compilation on installer verification class

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