Comment and reply request

Added request to comment and reply comments. #9
Hide a link request

Added a request to hide a link. #7
Submit request

Added a request to submit a link to a subreddit. #10
Unhide link

Added a request to unhide link. #8
Login request params

Adding constants with params names
Retrieve inbox/unread/sent messages

Added request to retrieve inbox/unread/sent messages. #12
Compose request

Added request to compose request. #13
Read all messages request

Added a request to read mark all messages as read. #14
Subscribe request

Added request to subscribe and unsubscribe a subreddit. #15
Search request

Adding a request to search a subreddit by title and description. #16
Get subreddits

Added a request to get all new/popular subreddits. #17
Get comments request

Added a request to retrieve the comment tree for a given link. #18
Authorization request

Added a request to retrieve the access token. #20
Util class

Added an util class with static methods used around the whole project
Move mock classes

Changed the mocks classes packages.
Authentication request tests

Adding the unit tests for AuthenticationRequest.

Closes #20
More tests

Adding more tests