Move all apps to Python 3

[iambibhas]

Py2 is reaching EOL. All apps need to port to Py3. We're using 2to3 to update codes and creating PR. Going to tag this issue in all the PRs to keep track of them.

[iambibhas]

Issue with moving Hasjob, it's throwing this exception -

~/W/h/hasjob ❯❯❯ FLASK_ENV=development ./runserver.py                   (hasgeekpinned3)  ✘ 1 py3 ✭ ✱
Traceback (most recent call last):
  File "./runserver.py", line 5, in <module>
    from hasjob import app
  File "/Users/bibhas/Work/hasgeek/hasjob/hasjob/__init__.py", line 32, in <module>
    from . import models, views  # NOQA
  File "/Users/bibhas/Work/hasgeek/hasjob/hasjob/models/__init__.py", line 18, in <module>
    class POST_STATE(LabeledEnum):
  File "/Users/bibhas/Work/hasgeek/hasjob/hasjob/models/__init__.py", line 34, in POST_STATE
    UNPUBLISHED = {DRAFT, PENDING}
TypeError: unhashable type: '_LazyString'

It probably has something to do with flask-babelex. More issue there - hasgeek/baseframe#181 (comment)

No error if we use gettext instead of lazy gettext.

[jace]

It probably has something to do with flask-babelex. More issue there - hasgeek/baseframe#181 (comment)

No error if we use gettext instead of lazy gettext.

This has been resolved via https://github.com/hasgeek/flask-babelhg