Need help cleaning up the code

[gulbinas]

At the moment we have passing tests on master branch.
Tests include pep and lint.
At the moment there is many disabled lint errors:

# R0201    Method could be a function
# C0111    No docstring
# W0511    TODO can be
# W0212    Access to a protected member  of a client class
# W0622    Redefining built-in 'id'
# R0924    Badly implemented Container, implements __getitem__ but not __delitem__, __len__, __setitem__
# C0103    Invalid name "CallableDocument" for type variable (should match [a-z_][a-z0-9_]{1,30}$)
# R0903    53,0:MongoKitConnection: Too few public methods (1/2)
# E1101    No member
# W0221    Arguments differ from overriden method
# W0401,W0614,W0611 wildcard/unused import
# R0912    74,4:DocumentProperties._validate_descriptors: Too many branches (23/12)
# R0902:138,0:Document: Too many instance attributes (9/7)
# R0913:161,4:Document.__init__: Too many arguments (6/5)
# W0142:465,12:Document.generate_index: Used * or ** magic
# E0611    No name 'OperationFailure' in module 'pymongo.connection'
# R0915:486,8:SchemaDocument._validate_structure.__validate_structure: Too many statements (61/50)
# R0914:571,4:SchemaDocument._validate_doc: Too many local variables (16/15)
# E1102:186,30:Document.__init__: self.migration_handler is not callable
# W0702:261,8:Document.get_size: No exception type(s) specified
# W0102:628,4:Document.__deepcopy__: Dangerous default value {} as argument
# W0201:630,8:Document.__deepcopy__: Attribute '__dict__' defined outside __init__
# W0703:664,27:SchemaDocument._process_validators: Catching too general exception Exception
# W1201:116,16:DotedDict.__setattr__: Specify string format arguments as logging function parameters

Disabled lint errors are configured in .pylintrc file

You can easily contribute by fixing those errors.