add npm ignore

.npmignore

@@ -0,0 +1,39 @@
+lib-cov
+*.seed
+*.log
+*.csv
+*.dat
+*.out
+*.pid
+*.gz
+*.swp
+tags
+pids
+logs
+results
+build
+
+node_modules
+
+# extras
+*.swp
+*.swo
+*~
+.project
+peerdb.json
+
+npm-debug.log
+.nodemonignore
+
+.DS_Store
+db/txs/*
+db/txs
+db/testnet/txs/*
+db/testnet/txs
+db/blocks/*
+db/blocks
+db/testnet/blocks/*
+db/testnet/blocks
+
+README.html
+k*