* Add method to retrieve projects that the user is member of

* Fix methods to retrieve starred and owned projects

In these two methods the API URL was being created with two query
objects, which renders an invalid URL

* Remove trailing whitespace

* Rename method to retrieve project milestones

* Add method to retrieve group milestones

* Sanitize project ID before using it in path

* Add method to retrieve group milestone issues

* Add group_id to GitlabMilestone model

* Add method to retrieve project milestone issues

* Updated getGroup to better support path arguments

* Fix for setting new-group visiblity

* all properties need to be nullable

* Add printing_merge_request_link_enabled to projects

This was added upstream at:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12240

* Add method to share and un-share project with a group.

* Add another method to delete shared group link with ID numbers only.

* RepositoryTree, Branches, and Tags lists are paginated in the v4 api.

* Add the maximum per_page parameter to the query.

* Add create/update/delete Repository files

* Fix create/update verb

* Add a createProject method that takes all the options

This is intended to allow https://gitlab.com/gitlab-org/gitlab-ce/issues/32935 to be worked around, but maybe it will be more generally useful too.

* Replace the bogus "visibilityLevel" value with the correct "visibilty" field

* New methods to retrieve Merge Requests with a given status

* improvement of the API to retrieve the Merge Requests

* new method to cherry-pick a commit

* new cherryPick method with a GitlabProject and javadoc

* fixed cherryPick method url and method

* moves MergeRequest status constants

* fixes update/accept Merge Request URLs

* usage of the GitlabMergeRequest constant for the URL

... and every other group creation option that is presently documented.

* #201 initial support for v3 -> v4 api changes.

* Introduce Docker for testing

* Switch to Maven in travis because releases are built with Maven anyway
* Introduce Maven-Wrapper to fixate the used Maven version.
* Reuse existing GitlabAPITest as integration test which will be run
  always when docker is available.
* Use docker-maven-plugin for starting/stopping GitLab.
* For use with Maven run `mvn -Pdocker-gitlab clean verify`. Starting
  GitLab takes a long time (>100 seconds on my Macbook Pro).
* For use in the IDE run:

```
mvn -Pdocker-gitlab,docker-ide docker:start
mvn -Pdocker-gitlab,docker-ide docker:stop
```

* Extract APIForIntegrationTestingHolder

* username/password sessions per time unit are limited

* Need at least source and target 1.7

AssertionError in Tests is only available for >= JDK7

* Use GitlabUploadIT as another integration test

* Don't choke when dockerized SUT is not available

Need to throw AssumptionViolatedException in BeforeClass because
otherwise the class is not initialized correctly.

* Add CONTRIBUTING.md and travis badge.

* Fix API calls for user block/unblock, add some calls

* block/unblock uses POST instead of PUT.
* Add ability to refine permissions for branch protection.
* Add ability to add deploy key with push permission.

* Fix getRawFileContent and getRepositoryTree

* Fix typo

* Do not attempt to map to a Void object