updated abstractBatcher to avoid potential ConcurrentModificationException with smaller batch sizes under load. Closes #157
switch to using putIfAbsent semantics. USERGRID-1753
latest round of changes - much more simplified API addressing USERGRID-1753
Merge branch 'master' into USERGRID-1753
moved to using volatile, works on all test boundaries
adjustment for testing values of serial counter submission
added wait on serial submit
Merge pull request #183 from apigee/USERGRID-1753

Usergrid 1753