Reorganize test folder
Simplify exhaustive tests
Update instructions on coverage analysis
Consider tests to be slow only if longer than 2s
Tests that exercise Selenium server are long
Replace test --exhaustive by run-script test-exhaustive
Remove all ./go test
Move all testing facilities to npm scripts
Re-enable coverage analysis
Fixes #96
Switch to Q's async traces instead of longjohn module
Remove asyncTracesLimit config option
Now default, provided by Q
Closes #88
Improve detection and logging of exceptions
Bump version number