* add GC benchmark suite
replace runbench.d with a version derived from d_do_test.d
missing executeArgs for benchmarks

- avoid implicit array to boolean conversion (Issue 4733)
terminate runbench on signal

- fixes CTRL+C to abort the test runner
Merge pull request #2 from MartinNowak/stop_on_signal

terminate runbench on signal
Merge pull request #1 from MartinNowak/fix_gc_bench

missing executeArgs for benchmarks
Merge pull request #818 from rainers/gc_bench

add GC benchmark suite