eslint: Warning for ignored files on linting

What version of ESLint are you using? eslint 2.4.0

What parser (default, Babel-ESLint, etc.) are you using? babel-eslint 6.0.0-beta.6

Please show your full configuration:

.eslintrc.json

{
    "root": true,
    "extends": "airbnb/base",
    "rules": {
        "indent": [
            2,
            2
        ],
        "quotes": [
            0, "double"
        ],
        "linebreak-style": [
            2, "unix"
        ],
        "semi": [
            2, "always"
        ],
        "no-unused-vars": [
            1, {
                "vars": "all",
                "args": "none"
            }
        ],
        "no-var": [1],
        "no-fallthrough": [1]
    },
    "env": {
        "es6": true,
        "node": true
    },
    "ecmaFeatures": {
        "modules": true
    },
    "globals": {
        "logger": true,
        "log4js": true
    },
    "parser": "babel-eslint"
}

.eslintignore

*.min.js
build/

What did you do? Please include the actual source code causing the issue. eslint **/*.js

What did you expect to happen? Not to show my ignored files WARNING while linting.

What actually happened? Please include the actual, raw output from ESLint.

MyProjects/NodeApp/md-urls  create-lib-WIP ✗                           0m ↑⚑  ⍉
▶ npm run lint

> md-urls@0.0.3 lint /home/abhisekp/MyProjects/NodeApp/md-urls
> eslint **/*.js


/home/abhisekp/MyProjects/NodeApp/md-urls/bin/cli.js
  5:13  warning  'program' is defined but never used  no-unused-vars

/home/abhisekp/MyProjects/NodeApp/md-urls/build/CONTRIBUTING.js
  0:0  warning  File ignored because of a matching ignore pattern. Use --no-ignore to override

/home/abhisekp/MyProjects/NodeApp/md-urls/build/app.js
  0:0  warning  File ignored because of a matching ignore pattern. Use --no-ignore to override

/home/abhisekp/MyProjects/NodeApp/md-urls/build/index.js
  0:0  warning  File ignored because of a matching ignore pattern. Use --no-ignore to override

/home/abhisekp/MyProjects/NodeApp/md-urls/lib/app.js
  1:5  warning  'x' is defined but never used  no-unused-vars

✖ 5 problems (0 errors, 5 warnings)