I am intersted at your crashmonkey，but i found some obvious bugs. maybe，you can fix it.
1 at copy_diff.sh:27
if [ -e build/diff* ]
when there are two diff* files match ; shell script will exit incorrectly；
suggest ： if [ -n "$(ls build/| grep diff)" ]
2 at ace.py variable file_names， incomplete type judgment
if isinstance(file_names, basestring):
balabalabala
else
file_name = file_names[0] #when file_names is None , it can not generate nested seq-1 ;
i have tried "python ace.py -l 1 -n True -d false",your ace will always report None Type Error.
I am intersted at your crashmonkey，but i found some obvious bugs. maybe，you can fix it.
1 at copy_diff.sh:27
2 at ace.py variable file_names， incomplete type judgment
i have tried "python ace.py -l 1 -n True -d false",your ace will always report None Type Error.