Adds support for MongoDB

- Adds sails-mongo adapter
- Adds adapter configurations for DEV, STAGE and PRODUCTION
- Adds configuration for using MongoDB in Travis CI
Loads countries when sails is lifted

Checks if there are countries in the collection and if not,
it loads them
Fixes reporting when new countries are seeded

- Uses the result passed in the callback instead of the original
  country object
- Uses sails.log instead of console.log
Fixes error message
Merge branch 'master' into mongodb

Conflicts:
	package.json
Merge pull request #10 from skanct/mongodb

Mongodb