Fix #1995 - Adds proper unicode handling for Form data

[karlcow]

This fixes the issue that @softvision-oana-arbuzov found and a couple of others related to unicode in the form (that were not seen before because of breaking in cascade).

→ nosetests -v --nocapture tests/test_form.py
Statuses Initialization…
Fetching milestones from Github…
Milestones saved in data/
Milestones in memory
The data body sent to GitHub API. ... ok
Check that domain name is extracted. ... ok
Checks we return the right form with the appropriate data. ... ok
HTML comments need the right values depending on the keys. ... ok
Check that metadata is processed and wrapped. ... ok
Avoid some type of strings. ... ok
Check that URL is normalized. ... ok
Check that appropriate radio button label is returned. ... ok

----------------------------------------------------------------------
Ran 8 tests in 0.007s

OK

form tests are passing. Added a couple of tests.

And the general unittests are still passing.

→ nosetests --nocapture
Statuses Initialization…
Fetching milestones from Github…
Milestones saved in data/
Milestones in memory
........................................................................
----------------------------------------------------------------------
Ran 72 tests in 2.060s

OK

[karlcow]

r? @miketaylr
r? @zoepage

[miketaylr]

thanks karl