Small refactoring, mostly related to design-related code review comments.

  - no intermediary "client" anymore. Base class for interface definition, and
    UltraDNS implementation derived from that base class.
  - Removed "get_records_by_type" method, added "rtype" param to the "get_records" method instead.
  - Removed docstrings from UltraDNSClient class, because interface is defined in a base class.
Processed code review comments:
  - long lines
  - client_ultradns.py renamed.
Fix version. Bump minor version, not release version.
Fixed code review comments. Mostly from Snitch.
Fix Snitch's comments.
Process code review comments.
Mostly minor changes.
Imports -> PEP8
Remove base class, which actually was just an interface description.
Because Seryoha said so.
Code review comments.
Removed blank line at the end of file.
account_name is now a property.
Merge pull request #2 from yola/code-cleanup

Small refactoring, mostly related to design-related code review comments...