Implement 'Users' endpoints

[asm0dey]

No description provided.

[asm0dey]

URL	Verbs	Meaning	state
/users	GET	Retrieve all the users	[x]
/users/{ids}	GET	Retrieve a set of users via a semi-colon separated list of IDs	[x]
/users/{ids}/comments	GET	Retrieve all the comments made by a set of users via a semi-colon separated list of IDs	[x]
/users/{ids}/questions	GET	Retrieve all the questions made by a set of users via a semi-colon separated list of IDs	[x]
/users/{ids}/answers	GET	Retrieve all the answers made by a set of users via a semi-colon separated list of IDs	[x]
/users/me	GET	Retrieve the current user
/users/me/comments	GET	Retrieve the current users comments
/users/me/questions	GET	Retrieve the current users questions
/users/me/answers	GET	Retrieve the current users answers

[asm0dey]

@svtk @garthgilmourni I have a bit of an issue here. We have several /me endpoints, but they are impossible to implement until we add the authentication layer. Do you mind if I move them to a separate issue?