Add top_level_only parameter to GroupFilter

Fix #800 Increase max Artifact size from Integer to Long

Fix gitlab4j#805 Increase CommitStatus id from Integer to Long

Adding branches_to_be_notified to SlackService

Webhook support for Release and Deployment events

Change position to be Double instead of Integer

Added Paging- and Stream-Support for Jobs in Pipeline.

Groups: add support for custom attributes

fix: add missing attribute `resolved_at` to `Note` class

add support for PackageFilter in PackagesApi

 Add ability to read resource state events for Issues

Add support for ci_config_path and ci_forward_deployment_enabled properties to Projects API

Support larger file sizes by expanding the size type to a Long.

Add 'runners_token' attribute to group model.

Fix #769

# Conflicts:
#	src/main/java/org/gitlab4j/api/ProjectApi.java
#	src/main/java/org/gitlab4j/api/models/ProjectHook.java

Adding branches_to_be_notified to SlackService and deprecating notify_only_default_branch as per
https://docs.gitlab.com/ee/api/services.html#createedit-slack-service

based on docs https://docs.gitlab.com/ee/api/packages.html and inspired by GroupProjectsFilter

Fix delete discussion API

Add the bot flag to the User class