Dependency updates, fixes required for successful release (#1966)

* A number of fixes required for successful build after upgrades

- extract now takes an absolute directory only
- something changed, so we now need to force NODE_ENV=production; we use
  electron-is-dev for this
- electron-builder, electron-publisher-s3, and electron-updater are now
  updated to their latest available versions

* Add direct dependency on extract-zip, since we use it directly

* Load 'config' module after we've modified NODE_ENV

* Downgrade electron-builder due to bug, downgrade icon-maker too

The latest electron-builder came with a fix for one of our bugs as well
as a new bug that blocks builds on Windows: https://github.com/electron-userland/electron-builder/issues/2462

There's no good reason to upgrade icon-maker. And a good reason to keep at the version on github: https://github.com/jaretburkett/electron-icon-maker/issues/7

app/config.js

@@ -1,12 +1,9 @@
 const path = require('path');
 
-const config = require('config');
+const electronIsDev = require('electron-is-dev');
 
-const packageJson = require('../package.json');
-
-
-const environment = packageJson.environment || process.env.NODE_ENV || 'development';
-config.environment = environment;
+const defaultEnvironment = electronIsDev ? 'development' : 'production';
+const environment = process.env.NODE_ENV || defaultEnvironment;
 
 // Set environment vars to configure node-config before requiring it
 process.env.NODE_ENV = environment;
@@ -22,6 +19,10 @@ if (environment === 'production') {
   process.env.SUPPRESS_NO_CONFIG_WARNING = '';
 }
 
+// We load config after we've made our modifications to NODE_ENV
+const config = require('config');
+
+config.environment = environment;
 
 // Log resulting env vars in use by config
 [