Update AllRecipes parser

[dpapathanasiou]

The AllRecipes parser no longer retrieves active URLs correctly:

>>> recipe = AllRecipes("http://allrecipes.com/recipe/8026/sugarless-fruitcake/")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/denis/repos/repos-git/recipebook/parser.py", line 36, in __init__
    raise ValueError('could not fetch data from: ""' + self.url + '""')
ValueError: could not fetch data from: ""http://allrecipes.com/recipe/8026/sugarless-fruitcake/""

>>> recipe = AllRecipes("https://www.allrecipes.com/recipe/13496/sweet-potato-casserole-iii/")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/denis/repos/repos-git/recipebook/parser.py", line 36, in __init__
    raise ValueError('could not fetch data from: ""' + self.url + '""')
ValueError: could not fetch data from: ""https://www.allrecipes.com/recipe/13496/sweet-potato-casserole-iii/""

reference: dpapathanasiou/recipes#4