Fixed pysam version in setup.py.
setup.py merged
Merge branch 'master' into develop

o that if there are any conflicts, I can resolve in the development branch itself and my master remains clean.

Merge branch 'master' into develop
fixed two bugs (Issues on github). 
ArgumentError in workerprocess and ZeroDivisionError in MakeScaffolds.
this version is 1.0.4.3