+ linux binaries

* use paths based on OS
* minimal install

modules/geth.js

@@ -3,6 +3,8 @@ const {app, dialog} = require('electron');
 const appRoot = require('app-root-path');
 const path = require('path');
 const fs = require('fs');
+const os = require('os');
+
 
 class Geth {
   constructor() {
@@ -14,6 +16,22 @@ class Geth {
     } else {
       this.rootPath = appRoot.path;
     }
+
+    switch(os.type()) {
+      case "Linux":
+        this.binaries = path.join(this.rootPath, 'bin', 'linux');
+        break;
+      case "Darwin":
+        this.binaries = path.join(this.rootPath, 'bin', 'macos');
+        break;
+      case "Windows_NT":
+        this.binaries = path.join(this.rootPath, 'bin', 'win');
+        break;
+      default:
+        this.binaries = path.join(this.rootPath, 'bin', 'win');        
+    } 
+
+    
   }
   
   _writeLog(text) {
@@ -23,7 +41,7 @@ class Geth {
   startGeth() {
     // get the path of get and execute the child process
     try {
-      const gethPath = path.join(path.join(this.rootPath, 'bin'), 'geth');
+      const gethPath = path.join(this.binaries, 'geth');
       this.gethProcess = child_process.spawn(gethPath, ['--ws', '--wsorigins', '*', '--wsaddr', '127.0.0.1', '--wsport', '8546', '--wsapi', 'admin,db,eth,net,miner,personal,web3']);
       this.gethProcess.on('error', function(err) {
         dialog.showErrorBox("Error starting application", "Geth failed to start!");
@@ -42,8 +60,12 @@ class Geth {
   }
 
   stopGeth() { 
-    const gethWrapePath = path.join(path.join(this.rootPath, 'bin'), 'WrapGeth.exe');
-    child_process.spawnSync(gethWrapePath,  [this.gethProcess.pid]);
+    if (os.type() == "Windows_NT") {
+      const gethWrapePath = path.join(this.binaries, 'WrapGeth.exe');
+      child_process.spawnSync(gethWrapePath, [this.gethProcess.pid]);  
+    } else {
+      this.gethProcess.kill('SIGTERM');
+    }
   }
 }