Changes in User, Author, Reader; also, adding GPSLocation file.

[gramirezualberta]

note: I haven't pull the changes into the Team repository, but they are all in my repository.

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Changes in User.java

• Now, it has two constructors. One the take a location as parameter, and another take a location and username(string) as parameter.
• need to be test I add a ID to user, I guess we'll need it when we start working in elasticsearch.
• adding the usual getters and setters.

Changes in Author.java

• (need to be test) I add an ArrayList that would represent all top level comment of this user.
• (need to be test) Function that a the new top level comment to the list.

Changes in Reader.java

• Add an ArrayList of all favourites comments that user have.

Adding GPSLocation.java

This class check if the user has GPS/Network enabled and determine the location of the user