Initial Service Implementation for loading users
Implemented the IUser Interface and implemented parsing on the server
Merge remote-tracking branch 'origin/async'

Conflicts:
	src/ca/ubc/cpsc310/gitlab/client/GitLab.java
	src/ca/ubc/cpsc310/gitlab/client/user/User.java
Revert "Merge remote-tracking branch 'origin/async'"

This reverts commit 45db4f9d4da807fd81c8d8975cc5b6dc5c966dd9, reversing
changes made to be8724b70a649012d9d0ccdc02df0703331c9a65.