remove orphaned variable
examples: python: added python3 support
examples: python: fixed batch update_stats()

This fixes nasty bug introduced by:
    examples: python: use isinstance() to suport inheritance

Pointy hat to: me
TODO: proper tests for update_stats
examples: python: use .format
examples: python: split sample and send

This will simplify testing
examples: python: prettify doctests
examples: python: sampling used only in counters
examples: python: renamed update_stats to counter
examples: python: renamed sampleRate to sample_rate and make it mandatory
examples: python: inline sample_send
examples: python: removed __main__ case

We have doctests for that
examples: python: removed useless comment
examples: python: library should not print anything

Acctually raising an exception in case of an error is very pythonish.
examples: python: general format function
exmaples: python: add gauges support
examples: python: added sets support
examples: python: unify parameter names
examples: python: simplify code by (re)introducing update_stats
examples: python: simplify fastpath
Added status to debian init.d script