chore(release): 2.1.2 (optimizely#126)

* Fix(nodejs/event_dispatcher): update error/resp handlers (optimizely#123)

- (nodejs) Prevent crash when `http`/`https` emits an error by adding an 'error' listener
- (nodejs) Fix `requestCallback` to conform to its role as a 'response' listener; notably, ensure it is called when the first argument is interpeted as the `http.IncomingMessage`, and _not_ called in the event of an error (as expected by `Optimizely#_sendImpressionEvent`/`Optimizely#track`).

Tested that this version (as 2.1.2-0) _does_ emit the messages expected in the demo app.

Fixes optimizely#122
Fixes optimizely#124

chore(release): 2.0.5 (optimizely#125)

* Fix(nodejs/event_dispatcher): update error/resp handlers (optimizely#123)

- (nodejs) Prevent crash when `http`/`https` emits an error by adding an 'error' listener
- (nodejs) Fix `requestCallback` to conform to its role as a 'response' listener; notably, ensure it is called when the first argument is interpeted as the `http.IncomingMessage`, and _not_ called in the event of an error (as expected by `Optimizely#_sendImpressionEvent`/`Optimizely#track`).

Tested that this version (as 2.1.2-0) _does_ emit the messages expected in the demo app.

Fixes optimizely#122
Fixes optimizely#124

chore: 2.1.1 release (optimizely#118)

* Fix impression sent from feature experiment variation toggled off. (optimizely#117)

chore: release 2.0.4 (optimizely#119)

* Fix impression sent from feature experiment variation toggled off. (optimizely#117)

chore: merge 2.0.x back into master (optimizely#107)

2.0.3

2.0.2 (optimizely#104)

2.0.0-beta1