Merge pull request #58 from sfat/master

Small improvements
restclient to restClient
Renamed com.github.jreddit.message.Comment to MessageComment in order to avoid confusion with the com.gihbub.jreddit.comment.Comment. The first is a comment(like a reply) from a message, while the latter is an actual Comment
Moved CommentsSort to Comments package and added missing CommentSort options
Added InvalidURIException to deal with Invalid location requests. Added it to the GET method
Renamed TypePrefix to Kind (more accurate naming for the reddit "kind" of a post), and added 2 more Kinds: LISTING and MORE
Merge pull request #61 from JamesGold23/master

restclient to restClient
Merge pull request #63 from RaulLepsa/master

Some refactoring and improvements
Implemented Comments For Article. Fixes #26
Created Unit test for CommentsForArticle functionality
Merge pull request #64 from RaulLepsa/master

Implemented the Comments for an Article functionality
Fixes #66. Removed 3-param constructor from Submission. When retrieving submissions, fetch all the data from them. Implemented helper functions for converting json to Double, Long and Boolean.
Refactored Submission class to remove unnecessary (and definitely wrongly implemented) info method. Refactored getters
Merge pull request #67 from RaulLepsa/master

Refactored Submission functionality
Created constants for saving/unsaving a submission.
Implemented save (with and without categories) and unsave.
Added tests for save / unsave.  Unsure about the category save at the moment.
Implemented save (with and without categories) and unsave.
Removed empty test.
Added save and unsave to 'implemented'.