code: function checkEnv() {
          async.series([
              function(cb) {
                  childProcess.exec(
                      'python -c "import django; print(django.get_version())"',
                      function(err, version) {
                          if (err || !/^1\.7/.test(version)) {
                              return cb(new Error(
                                  'Django 1.7 environment is not working'
                              ));
                          }
                          cb();
                      });
              }
          ], function(err) {
              if (err) {
                  console.error(chalk.red('\nFATAL: ' + err.message +
                      '\n'));
              }
          });
      }
docs: Check dependencies.
  
  @since 0.1.1
  @throws {Error} If checking failed.