Only install global error handler if we have at least one subscriber
Merge #35

Remove jQuery support and update .gitignore
Merge branch 'global-handler' of https://github.com/silkapp/TraceKit into silkapp-global-handler
Use an internal flag to check whether the global handler is installed or not
ominous update to readme contributing section
Merge pull request #40 from devinrhode2/patch-1

ominous update to readme contributing section
Don't wrap setTimeout/setInterval automatically