Issues, ProjectMembers, and notes (for issues, not just MergeRequests)


* new connect method for authentication with username and password using "/session" in GitlabAPI
* create, update, and get issues for a specific project (get *all* issues does not exists yet)
* create and get notes for a specific issue
* get project members for a specific project
* get milestones for a specific project
* moved some code into a generic method (paged results)