Fix issue with callback not passing an err in node-firmata.
Added examples for imperative (jquery) style.
Renamed to fluent style instead of jquery.
Added fluent style examples.
Fix tests, checking callback still pending.
Add assertion for callbacks in digital and analog reads.
Remove start listener for i2c devices since now the event is triggered before the work starts.
Merge pull request #31 from hybridgroup/fluent-examples

Fluent examples and small cleanup/fixes to some declarative examples.