Abort directory execution on failure

[jgroom33]

When executing strest foo_dir/ file2 will run tests even if there is a failure from a request in file1

Option 1

Support strest --abort foodir/

Option 2

Change default behavior to abort directory execution if a request fails.
This might also require the ability to override this behavior in a per file basis:

version: 1
continue: true
...

[jgroom33]

resolved