fixed #28 and other small node.js issues

lib/filter.js

@@ -23,10 +23,7 @@
  * @date 2014
  */
 
-// TODO: is these line is supposed to be here? 
-if (process.env.NODE_ENV !== 'build') {
-    var web3 = require('./web3'); // jshint ignore:line
-}
+var web3 = require('./web3'); // jshint ignore:line
 
 /// should be used when we want to watch something
 /// it's using inner polling mechanism and is notified about changes