Created header files simul-fixed-seed.h and simul-random-seed.h
Edited makefile to create rsem-simulate-reads-fixed-seed

rsem-simulate-reads-fixed-seed is linked after first replacing simul.h with simul-fixed-seed.h.  This way the random number generators seed is fixed and we can reproduce the results.  To ensure that rsem-simulate-reads uses a random seed simul.h is replaced with simul-random-seed.h before linking.  simul.h should be the same as simul-random-seed.h except right before linking rsem-simulate-reads-fixed-seed.
Created .gitignore

Ignore *.o and files created during make all.