Adding a reporter to periodically report all metrics to hosted graphite using the Http Interface
applied autopep8 to reformat the code
applied autopep8 on setup.py and tests, too
HostedGraphiteReporter now looks less like a Java class
make blinker dependency optional (better use own signal implmentation?) and remove not used six dependency; corrected license string
added clear method, fixes issue #4: Timer.clear() call raises exception because it calls to Meter.clear() which is not implemented
hosted graphite reporter does not required twisted anymore