Update dependencies

Refs #4240
- grunt-mocha-cli@1.11.0 (v0.12 support)
- moment@2.8.3
- knex@0.7.3
- express@4.10.2
- validator@3.22.1
Merge pull request #4437 from jaswilli/deps

Update dependencies
Work with case-sensitive email addresses

Closes #4235
Merge pull request #4320 from felixrieseberg/iss4235

Work with case-sensitive email addresses
Do not eagerly fetch relations in when finding all posts

fixes #4232
- do not fetch tags and fields relations in post.findAll()