Add push token service

Add the push token service to activate the push notification system on rocket chat server

Add http call for all subscription update list

0.0.17

* Add http call for all subscription update list

Add webSocket connection, notification and message

0.0.14

* Add webSocket connection, notification and message

Remove authentication stored in httpService

* Remove authentication stored in httpService

* Update http call with specific exception returned

Add login exception on authentication failed

* Add login exception on authentication failed

* Add example

Fix http dependency

0.0.9

Fix http version

Force 0 on message counter null

0.0.8

Force 0 on message counter null

Fix wording and add room service methods counters, history

0.0.7

Fix wording and add room service methods counters, history

Add channel and room counters

0.0.4

Add channel and room counters

Update Message attributes

0.0.3

Create CHANGELOG.md