fix server crash when searching for a tag that doesn't exist in the database
fix spacing.
Merge branch 'master' of https://github.com/ReadUpCode/readup
Merge branch 'master' of https://github.com/ReadUpCode/readup
send response from server to denote tag not found
Merge branch 'master' of https://github.com/ReadUpCode/readup
Merge branch 'master' of https://github.com/ReadUpCode/readup

fixed a conflict with app/controllers/tag.js
Merge pull request #46 from DougKong/master

fix server crash when searching for a tag that is not in database.  send back notice that tag is not found.