Added sidebar with 5 most recent books.
We can change the side bar as necessary and include what ever we desire.
During this I found a few bugs:

	* we create a new user file on line 81 and I don't think we need to
	* We should create a seprate function for obtaining a users profile
	* view.html's {{.body}} needs to be limited to a specific number of pixels
	* I should look into making css compatible with devices of different screen sizes
Reduce, Reuse, Recycle.

I created a "FindUser" function under the package user. It replaced 5
pieces of copy-pasta'd code. I also fixed a small bug with profile creation.
Merge remote-tracking branch 'upstream/master'
Added file downloads for book collection.
Maxed book collection to 5 books for the moment.
Cleaned up some stuff, relating to file downloads
Added a small todo list
Some minor changes to layout, centered the body and made a max width.
Update main.go
Update bkz.go
Added an error message, still has isbn.info instead of a pdf download, need
to add the .info ;)
Merge pull request #11 from lettergram/master

Added sidebar and removed copy-pasta'd code (replaced with nice function)