image_view_counter: 
- added view counter
- only adds view every hour from same person
- no way to display to user/admin yet (todo)
image_view_counter: 
- now displays views below image (only if it's okay with the admin settings)
- comment changed
image_view_counter: also saving with user ID with addview() for later use
arrow key navigation through images
allows visitors to use left-right keyboard keys to navigate to different images using post/next/(id) and post/prev/(id)
Fixed problems from notes by shish
Added arrowkey navigator to post/list as well
arrowkey navigator also works with tags on post/list now
arrowkey navigation on post/list now supports tags
also correctly handle post/list without a page ID given
/post/view now also supports things like /post/view/4#search=tag1
oops, forgot something
Custom HTML Headers added
I may also expand it to allow headers specific pages later
Merge pull request #280 from DrudexSoftware/master

Image View Counter, Arrow Navigation, and Custom HTML Headers