Merge in latest improvements. (#24)

Several improvements, and fixes issue with callback.

* Fixed bug with invalid path to exec and pend invalid exception
* Mocha and chai unit test
* Package version update and appveyor duplicated key fix
* Fix for node env
* Invalid yaml character
* Invalid npm install type
* build: off flag
* Mocha path instead of run test task
* Mocha execution
* npm command fix
* Mocha powershell script
* add ps scripts to npm install
* npm run test
* appveyor config for mocha
* npm run test diffrent mocha exe
* install section
* Appveyor badge
* fixed invalid readme formatting
* small typo fix clientTets -> clientTests
* add support to node on OS other than Windows
* removed unused callback function
* node condition fix
* comments

Author: gittheking

.vscode/launch.json

@@ -1,23 +1,23 @@
 {
-    // Use IntelliSense to learn about possible attributes.
-    // Hover to view descriptions of existing attributes.
-    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
-    "version": "0.2.0",
-    "configurations": [
-        {
-            "type": "node",
-            "request": "launch",
-            "name": "Mocha Tests",
-            "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
-            "args": [
-                "-u",
-                "tdd",
-                "--timeout",
-                "999999",
-                "--colors",
-                "${workspaceFolder}/test"
-            ],
-            "internalConsoleOptions": "openOnSessionStart"
-        }
-    ]
-}
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Mocha Tests",
+      "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
+      "args": [
+        "-u",
+        "tdd",
+        "--timeout",
+        "999999",
+        "--colors",
+        "${workspaceFolder}/test"
+      ],
+      "internalConsoleOptions": "openOnSessionStart"
+    }
+  ]
+}

lib/index.js

@@ -517,18 +517,19 @@ BacktraceReport.prototype.sendSync = function() {
   var stdioValue = debugBacktrace ? 'inherit' : 'ignore';
   var payloadString = JSON.stringify(this.payload);
 
+  // send reports for processes other than node
+  // for example from production electron application
   const execName = path.basename(process.execPath);
-  if (execName !== 'node.exe') {
+  if (execName !== 'node.exe' && execName !== 'node') {
     sendReport(this.payload, err => {
-      if (callback) {
-        callback(err);
-      } else if (err && debugBacktrace) {
+      if (err && debugBacktrace) {
         console.error(err.stack);
       }
     });
     return;
   }
 
+  // spawn send process when node process is available
   spawnSync(process.execPath, args, {
     input: payloadString,
     timeout: timeout,