Fixes and changes 2

[bundleman]

1. Fix bug, when headers and cookies passed through .fql scripts not sets into request.
2. Added able to return source error (example, status code from http driver).

[codecov]

Codecov Report

Merging #614 (3b7a087) into master (80c278e) will decrease coverage by 0.1%.
The diff coverage is 9.5%.

❗ Current head 3b7a087 differs from pull request most recent head 22fbc25. Consider uploading reports for the commit 22fbc25 to get more accurate results

@@           Coverage Diff            @@
##           master    #614     +/-   ##
========================================
- Coverage    34.6%   34.5%   -0.1%     
========================================
  Files         328     328             
  Lines       10188   10215     +27     
========================================
- Hits         3523    3521      -2     
- Misses       6290    6317     +27     
- Partials      375     377      +2