Replaces pythons web server
Makes sure the results are send /handled in right order
Migrating test.py to test.js
Removes test.py
Handles HTTP redirects
Disables range requests for chrome windows during testing
Cleaning up the viewer and pdfbug; fixes repeats in Stepper
[Firefox] Only load 'PdfStreamConverter' and 'PdfRedirector' when PDF.js is enabled
Merge pull request #4525 from Snuffleupagus/firefox-move-module-import

[Firefox] Only load 'PdfStreamConverter' and 'PdfRedirector' when PDF.js is enabled
Partially reverts #3641
Merge pull request #4527 from yurydelendik/revert3641

Partially reverts #3641
Merge pull request #4519 from yurydelendik/pdfbugclean

Cleaning up the viewer and pdfbug; fixes bugs in Stepper
Merge pull request #4515 from yurydelendik/nodetest

Replaces test.py with test.js