Using chatter to post error messages only if it's enabled.
Merge pull request #392 from SalesforceFoundation/feature/visualforce-typeahead-update

Updating to the latest version of the visualforce-typeahead library.
Merge pull request #393 from SalesforceFoundation/feature/388-check-chatter-enabled

Feature/388 check chatter enabled
Merge dev into feature/visualforce-typeahead-update