fix so child process doesn't hang some cmds

lib/contracts/solcP.js

@@ -12,3 +12,7 @@ process.on('message', function(msg) {
   }
 });
 
+process.on('exit', function() {
+  process.exit(0);
+});
+

lib/contracts/solcW.js

@@ -1,4 +1,4 @@
-var solcProcess = require('child_process').fork(__dirname + '/solcP.js');
+var solcProcess;
 var compilerLoaded = false;
 
 var SolcW = function() {
@@ -6,6 +6,7 @@ var SolcW = function() {
 
 SolcW.prototype.load_compiler = function(done) {
   if (compilerLoaded) { done(); }
+  solcProcess = require('child_process').fork(__dirname + '/solcP.js');
   solcProcess.once('message', function(msg) {
     if (msg.result !== 'loadedCompiler') {
       return;
@@ -18,7 +19,7 @@ SolcW.prototype.load_compiler = function(done) {
 
 SolcW.prototype.isCompilerLoaded = function() {
   return (compilerLoaded === true);
-}
+};
 
 SolcW.prototype.compile = function(obj, optimize, done) {
   solcProcess.once('message', function(msg) {

lib/index.js

@@ -238,13 +238,14 @@ var Embark = {
         pipeline.build(abi);
         callback();
       }
-
     ], function(err, result) {
       if (err) {
         self.logger.error(err.message);
       } else {
-        self.logger.trace("finished".underline);
+        self.logger.info("finished building".underline);
       }
+      // needed due to child processes
+      process.exit();
     });
   },