My recent additions to jReddit

Hello everyone,

I have tried my best to merge in as many of the additions provided while I was implementing. 
Because of my inexperience in using Git(Hub) I did not merge frequently enough, which I will do
more often in the future. This is a fairly stable version of my implementations, see the examples
folder on how they work.

If anything needs to be fixed let me know. I will be on vacation for the next two weeks, after which I
will continue my research into Reddit again.

The changes request in pull request  #59 have also been included in this request (I have implemented it myself).

Best regards,
Simon

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<b>Small summary:</b>
Submission retrieval
Comment retrieval (layered)
Subreddit retrieval
Captcha asking for submitting posts
Submitting comments is possible
Hide/unhide/delete functionality
RequestExceptions thrown instead of null pointers
Tests for retrieval
New package structure

this is random one, but maybe you can replace the ```e.printStackTrace()``` with a ```System.out.println()```. Not sure if it would be a good idea to add something like a log4j or something similar.