v0.7.1
synchronize next() and hasNext() on calls with inner mutation
Test for concurrent reads
FlatMap generics nightmare
New concurrency test
Merge v0.7.1 branch (development) adds synchronization and fixes flatMap generics

* development:
  New concurrency test
  FlatMap generics nightmare
  Test for concurrent reads
  synchronize next() and hasNext() on calls with inner mutation
  v0.7.1
Merge branch 'master' of github.com:timyates/groovy-stream