Chore - Use Codecov + Simplify running tests

• Use Codecov instead of Coveralls.
• Simplify running tests.

Chore - Dependencies upgraded

Packages upgraded:

"mongodb": "^2.2.33 => "mongodb": "^3.0.1"
"babel-eslint": "~8.0.1" => "babel-eslint": "~8.1.2"
"babel-jest": "~21.2.0" => "babel-jest": "~22.0.4"
"eslint": "~4.9.0" => "eslint": "~4.15.0"
"flow-bin": "~0.57.3" => "flow-bin": "~0.63.1"
"jest": "~21.2.1" => "jest": "~22.0.4"

Tests has been updated to work with latest Mongodb package version.

Feat - removeUser method created

• removeUser method created to delete user.

Chore - Dependencies updated + version bumped

• Dependencies upgraded
• Version bumped

Fix - Sequelize store

Value size upgraded to 1000 chars.

Chore - Dependencies updated

Packages updated:

eslint-config-airbnb-base  ~12.0.2  →  ~12.1.0
mongodb    ^2.2.31  →  ^2.2.33
sequelize  ^4.13.8  →  ^4.14.0
flow-bin   ~0.57.2  →  ~0.57.3

Chore - Many changes

• Packages updated
• NPM run script test-only-with-coverage created
• Documentation : Test block created

Version bumped for npmjs

Version rebumped to force npm to prepare folder before publishing.

Fix - Entry point moved to src folder

Entry point moved to src folder to be compliant with require and import.

Fix small things on docker and travis

Small chore changes.