folder name with spaces (escape character) returns a cd error

Folder names like `Project One` with a space in between returns this error.
```sh
/usr/bin/bash: line 1: cd: too many arguments

[Process exited 2]
```

This fixed it for me.
```diff
          java = {
-            'cd $dir &&',
+            'cd "$dir" &&',
            'javac $fileName &&',
            'java $fileNameWithoutExt',
          },
```