Handle Ctrl+C gracefully

Basically, there are two things we need to do: exiting *gracefully*
without emitting backtraces, and exiting *promptly* without waiting
for tests currently in progress to finish (or even worse, tests that
haven't even started yet).
1 file changed
tree: a475958707d5030f3571c7450aafa8d934d48fcb
  1. .gitignore
  2. gtest-parallel
  3. LICENSE