Added openjdk7 to travis.
Added openjdk7 to travis.

southwolf/jodd,javachengwc/jodd,oetting/jodd,southwolf/jodd,mohanaraosv/jodd,tempbottle/jodd,wjw465150/jodd,wjw465150/jodd,javachengwc/jodd,southwolf/jodd,wjw465150/jodd,mtakaki/jodd,mtakaki/jodd,oblac/jodd,oblac/jodd,javachengwc/jodd,wjw465150/jodd,vilmospapp/jodd,mosoft521/jodd,tempbottle/jodd,oblac/jodd,oetting/jodd,mohanaraosv/jodd,mohanaraosv/jodd,mosoft521/jodd,tempbottle/jodd,oblac/jodd,mohanaraosv/jodd,oetting/jodd,mtakaki/jodd,southwolf/jodd,mtakaki/jodd,mosoft521/jodd,wsldl123292/jodd,oetting/jodd,vilmospapp/jodd,mosoft521/jodd,wsldl123292/jodd,wsldl123292/jodd,vilmospapp/jodd,wsldl123292/jodd,tempbottle/jodd,vilmospapp/jodd,javachengwc/jodd,vilmospapp/jodd