implement internal sample accumulator for streamed particles
Merge pull request #5 from petercable/accumulate

implement internal sample accumulator for streamed particles
change accumulate interval
synchronize access to parseMap
particles no longer json encoded inside sample event
bump mi-instrument version

Change-Id: Iba2132098eb6952a29ff9f25c0658696a6459209
Merge pull request #6 from petercable/accumulate

change accumulate interval