Refactor into an app factory [2 of 2] (#322)

* Replace all `from nyaa import app` imports with `app = flask.current_app` (or `from flask import current_app as app` where possible)
* Add a separate config object for top-level and class statements as `nyaa.extensions.config`
Required because those codes don't have app context at the time of evaluation/execution.
* Remove `routes.py` file and register all blueprints in `nyaa/__init__.py`
* Refactor `nyaa/__init__.py` into an app factory
* Update tools
* Update tests (temporary, will be replaced)

nyaa/forms.py

@@ -14,9 +14,12 @@ from wtforms.validators import (DataRequired, Email, EqualTo, Length, Optional,
 from wtforms.widgets import Select as SelectWidget  # For DisabledSelectField
 from wtforms.widgets import HTMLString, html_params  # For DisabledSelectField
 
-from nyaa import app, bencode, models, utils
+from nyaa import bencode, models, utils
+from nyaa.extensions import config
 from nyaa.models import User
 
+app = flask.current_app
+
 
 class Unique(object):
 
@@ -81,7 +84,7 @@ class RegisterForm(FlaskForm):
 
     password_confirm = PasswordField('Password (confirm)')
 
-    if app.config['USE_RECAPTCHA']:
+    if config['USE_RECAPTCHA']:
         recaptcha = RecaptchaField()
 
 
@@ -195,7 +198,7 @@ class UploadForm(FlaskForm):
                        '%(max)d at most.')
     ])
 
-    if app.config['USE_RECAPTCHA']:
+    if config['USE_RECAPTCHA']:
         # Captcha only for not logged in users
         _recaptcha_validator = RecaptchaValidator()