add logic to only have one version of an item.  append new tags and categories to original version of an item.
Merge branch 'master' of https://github.com/ReadUpCode/readup
add logic to register an upvote for any item submitted more than once
Merge branch 'master' of https://github.com/ReadUpCode/readup
cast an upvote for the user who posted the item
Merge branch 'master' of https://github.com/ReadUpCode/readup
Merge branch 'master' of https://github.com/DougKong/readup
adding favicon to index.html
Merge branch 'master' of http://github.com/ReadUpCode/readup
clean up code by making functions for adding tags and categories to an item
Merge branch 'master' of https://github.com/ReadUpCode/readup
Merge branch 'master' of http://github.com/ReadUpCode/readup
package.json now uses amazon sdk
home and tag views now sorted alphabetically and descending respectively
Merge pull request #73 from macqueen/master

related tags styling
Merge pull request #74 from BrettHoyer/master

favicon, sorting, and amazon sdk (amazon s3 changes to follow during integration)
Merge branch 'master' of https://github.com/ReadUpCode/readup
refactored html a bit, and moved link-form show logic into a directive
removed dom manipulation from controller, moved it to a directive
removed some old console logs