Add complete multiplayer system with real-time gameplay, challenge system, and 50x50 board option

node_modules/is-property/.npmignore

@@ -0,0 +1,17 @@
+lib-cov
+*.seed
+*.log
+*.csv
+*.dat
+*.out
+*.pid
+*.gz
+
+pids
+logs
+results
+
+npm-debug.log
+node_modules/*
+*.DS_Store
+test/*