[python-pytrakt] Cleanup: Drop classes extending from object

[glensc]

This is not needed for Python3 as the "old style" classes don't exist and inheritance from object is implicit.

• https://stackoverflow.com/questions/15374857/should-all-python-classes-extend-object
• http://docs.python.org/release/2.5.2/ref/node33.html

[glensc]

Carried to my fork:

• https://github.com/glensc/python-pytrakt/commit/e74486f24d5da2dba5c8c2362ffd574b0f696e43