warn about cycling dependencies

lib/contracts/contracts.js

@@ -204,7 +204,16 @@ class ContractsManager {
       }
     }
 
-    let orderedDependencies = toposort(converted_dependencies).reverse();
+    let orderedDependencies;
+
+    try {
+      orderedDependencies =  toposort(converted_dependencies).reverse();
+    } catch(e) {
+      this.logger.error(("Error: " + e.message).red);
+      this.logger.error("there are two or more contracts that depend on each other in a cyclic manner".bold.red);
+      this.logger.error("Embark couldn't determine which one to deploy first".red);
+      process.exit(0);
+    }
 
     let newList = contractList.sort(function (a, b) {
       let order_a = orderedDependencies.indexOf(a.className);

lib/contracts/deploy_manager.js

@@ -55,6 +55,7 @@ class DeployManager {
       function setDefaultAccount(contractsManager, web3, callback) {
         web3.eth.getAccounts(function (err, accounts) {
           if (err) {
+            self.logger.error(err);
             return callback(new Error(err));
           }
           let accountConfig = self.config.blockchainConfig.account;

lib/core/test_logger.js

@@ -25,6 +25,7 @@ class TestLogger {
     if (!(this.shouldLog('error'))) {
       return;
     }
+    console.error(txt);
     this.logFunction(txt.red);
   }