Merge pull request #19 from cythoplazma/master

Pull request - MIGRATION to orange.biolab.si
Orange3 info page.
Import xmlrpc lib from six.
Refactor tag_extras.
Add tests.
Add Orange3 bundle download link.
Update orange3.html
Merge pull request #20 from lanzagar/patch-1

Update orange3.html
Use python2 instead of python command (PEP394)
Use whole filename (with extension).
Merge pull request #21 from lanzagar/patch-2

Use python2 instead of python command (PEP394)
Merge pull request #22 from lanzagar/patch-3

Use whole filename (with extension).
PEP8
Fix a failing test.
Added reCaptcha, code refactoring in progress.
Refactored some code, secret keys are now being stored server-side, enabled SMTP e-mail backend for production.