allow a list of excluded modules from TB
break out of both loops
fix tabs
Don't bork if no exclude modules specified
fix issue with config attr not existing
update README for new feature
Merge branch 'allow_custom_adapter' of https://github.com/HurricaneLabs/bugsnag-python into HurricaneLabs-allow_custom_adapter
Merge branch 'HurricaneLabs-allow_custom_adapter'