Merge pull request #86 from myclamm/staging

Database version 3 (longLat properties on beers)
Added 407 error code to iOS signup end point for an already taken username.
Merge pull request #88 from SunJieMing/master

Updated iOS signup endpoint
created euclidean distance recommendation algorithm, currently commented out
changed user similarity formula from cosine similarity to eucliden distance
Merge branch 'staging' of https://github.com/BeerWithMe/beer-finderWeb into staging