examples: python: unbreak example

After Statsd -> StatsdClient renaming example is borken.
examples: python: unbreak StatsdClient.send()

send() is defined as staticmethod, so it' does not have self. Fixing
this also requires all other methods convertion to non-static which is
logical assuming the should all use self.addr set by __init__().
examples: python: remove local_settings.py overrides

It's rather strange to override parameters passed to __init__ via custom
settings file.
examples: python: host and port are not used
examples: python: print exceptio to stderr
examples: python: do not catch BaseExceptions
examples: python: more useful errors
examples: python: StatsdClient.send() returns outcome

It's useful but unused.
examples: python: simplifications
examples: python: use isinstance() to suport inheritance
exmaples: python: unbreak doctests
examples: python: whitespacing
examples: python: move frequently used imports to the top
Avoid many redundant string concats in graphite backend
Merge pull request #206 from timbunce/graphite_ts_suffix

Avoid many redundant string concats in graphite backend
Use counter_rates in graphite backent
skip setting intermediate variable
Add two addtional graphite backend metrics
Line up concats
remove last_ prefix to avoid admin 'stats' match