resolves #30: job execution timeout

Add the ability to configure a timeout in seconds
after which a job run will be automatically aborted

test/test-run.cpp

@@ -24,6 +24,8 @@
 
 class RunTest : public ::testing::Test {
 protected:
+    virtual ~RunTest() noexcept override {}
+
     void SetUp() override {
         run.node = node;
     }