added concurrency factor to benchmark
added njsproj files for examples and comparison
using memwatch to monitor heap usage
'comparison' improvements

- added 'fibonacci' function
- added metrics for heap use/GC
- exposed (but not explained) problem with asyncawait recursion
- noted recursion problem with 'co' example files
Set concurrency to useful default
Semaphore improves concurrency issue (WIP)
ref LICENSE in sln
Merge remote-tracking branch 'origin/concurrency' into develop