Added random task execution time to readInputFromFile
-only uniform distribution is currently used

New input file should look like this:
N
PHASE_1 PERIOD_1 MIN_EXE_1 MAX_EXE_1 DISTRIBUTION_1
PHASE_2 PERIOD_2 MIN_EXE_2 MAX_EXE_2 DISTRIBUTION_2
...
PHASE_N PERIOD_N MIN_EXE_N MAX_EXE_1N DISTRIBUTION_3
END_OF_TIME

Currently, all distributions are set to 0 (uniform).