Adding incrementCounter by int n
Extracting StatsClient interface from StatsDClient for easier testing/mocking
add support for sampled counters
Merge pull request #1 from danklynn/master

Added sampled counter support
Adding incrementCounterSampled to interface
Added support for sampled counters. Merge remote-tracking branch 'xorlev/master'

Conflicts:
	src/main/java/com/timgroup/statsd/StatsDClient.java