Add binarypath back to readme and getBinaryArgs

Author: Blackbaud-PatrickOFriel

README.md

@@ -90,6 +90,13 @@ bs_local_args = { 'key': '<browserstack-accesskey>', 'localIdentifier': 'randoms
 
 ## Additional Arguments
 
+#### Binary Path
+ 
+ By default, BrowserStack local wrappers try downloading and executing the latest version of BrowserStack binary in ~/.browserstack or the present working directory or the tmp folder by order. But you can override these by passing the -binarypath argument.
+ Path to specify local Binary path -
+ ```node
+ bs_local_args = { 'key': '<browserstack-accesskey>', 'binarypath': '/browserstack/BrowserStackLocal' }
+ ```
 
 #### Logfile
 To save the logs to the file while running with the '-v' argument, you can specify the path of the file. By default the logs are saved in the local.log file in the present woring directory.

lib/Local.js

@@ -200,6 +200,11 @@ function Local(){
           this.parallelRunsFlag = value;
         break;
 
+      case 'binarypath':
+        if(value)
+          this.binaryPath = value;
+        break;
+
       default:
         if(value.toString().toLowerCase() == 'true'){
           this.userArgs.push('--' + key);