Upgrade should to 3.0.1
gulp task tests
Fix `.start(array)`
Fixes #24
Update README.md

Modified the onAll example to have the correct arity. For unknown reasons in the example the onAll method was being passed the orchestrator instance in addition to the callback.
drop unsupported travis versions

travis only supports the last stable, the current stable, and the current unstable.
also end the task on 'close' and 'finish'
The spec says ".then()" not ".done()" -- oops
Update Travis and David DM URLs and use SVG badges

[ci skip]
Only end the stream once: 'finish', 'end', or 'close'
Thanks Royston, move to `#then` completely
use end-of-stream to handle errors and all end events correctly
correct install on 0.8