<commit_before>v0.1.1, (upcoming version) -- Python 2.6 support

General changes:

* Python 2.6 and 3.x support fixed
* Cookies are not saved anymore between sessions

Python API:

* Internal exceptions are now of the class `DidelError` instead of `Exception`
* `DidelEntity#fetch` method now properly handle objects with no `path`
* `Session#load` and `Session#save` return a boolean indicating their success
* Some classes are imported in `__init__`, making them available with a shorter
  form:
      from didel import Student
  instead of:<commit_msg>preparing for the 0.1.1 release<commit_after>v0.1.1, (upcoming version) -- Python 2.6 support

General changes:

* Python 2.6 and 3.x support fixed
* Persistent Cookies (broken) support removed

Python API:

* Internal exceptions are now of the class `DidelError` instead of `Exception`
* `DidelEntity#fetch` method now properly handle objects with no `path`
* Some classes are imported in `__init__`, making them available with a shorter
  form:
      from didel import Student
  instead of:
{'fraction_non_alphanumeric': 0.07545367717287488, 'fraction_numerical': 0.018147086914995225, 'mean_word_length': 4.486910994764398, 'pattern_counts': {'":': 0, '<': 3, '<?xml version=': 0, '>': 3, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '3973425', 'n_tokens_mistral': 305, 'n_tokens_neox': 291, 'n_words': 134}