exit 0 or 1
Fix problem with table debug messages
Rewrite and simplify output handlers.
Clean up subscribers
Merge pull request #255 from Olivine-Labs/v2-output-handler-base

Rewrite and simplify output handlers.
2.0.rc1
Support for a helper (environment) script

Handy for preloading things prior to tests, etc
`.busted` was busted
Merge pull request #257 from nevir/patch-2

`.busted` was busted
Merge pull request #256 from nevir/patch-1

Support for a helper (environment) script
Use cliparse's new API, and handle error cases.
Merge pull request #258 from nevir/cliargs-fix

Use cliparse's new API, and handle error cases.
fix async spec
Handle errors in describe blocks

Fixes part of #260

Also, cc @kbambz :P
Merge pull request #261 from nevir/patch-3

Handle errors in describe blocks
fixed a few bugs related to error reporting. Removed async and made tests pending until I can come up with a clean way of re-implementing it. Current implementation of async did not play nice with output handlers
reordered bin/busted so cliargs can override more defaults from .busted
made error event handling better