Merge pull request #3 from Zomis/master

POM and stuff
Fixed application configuration to now be compatible with Jackson 2.x.
The commit hash in a push event is now an url, closes #5.
Updated readme to include a section about how to set up the bot account.
Fixed bug where push event would fail due to missing optional base_ref property.
Merged every type of user into a single Account class.
Added fix to allow both longs and timestamp strings in the created_at, updated_at and pushed_at properties of Repository.
Added support for create event.
Added support for delete event.
Added support for optional organization property on Repository.
Fixed issue where chatmessages would disappear, also closes #6.
Anything that is linkable, now gets a link, closes #7.
Updated API to reflect that the push event is a legacy event.
Added custom exception handling, including logging the exception, whenever one occurs in the github hook controller.
Added option to say a greeting to the room on deployment.
Added support for issue events.
ChatBot is now auto-wired, fixes #1