Enhancement

[SuperDzej]

Respected your repository has helped me with one small project so I would like to give back.

I have worked on improving SEAN.JS, added tests, total 99 tests available now, with code statements coverage of 60% and branches coverage of 50%.
Changed OAuth login routes to comply with MEAN changes. Tested Facebook login works as expected. Added the ability to upload images to s3 easier, removed predefined route to pictures because of s3 support, now the whole local path is saved to be able to use s3 properly.
Updated npm package versions to the latest.
Improved security with beforeCreate password hashing instead of manual hashing, added owasp password validation, added coverage to grunt and es6 support for uglify in build.