Added travis.yml and codecov badge for all our libs (#99)

* Fetch build data from remote server

* Added travis.yml and codecov badge for all our libs

.travis.yml

@@ -0,0 +1,22 @@
+language: php
+sudo: false
+
+matrix:
+    include:
+      - php: 7.0
+
+cache:
+    directories:
+      - "$HOME/.composer/cache"
+
+install:
+    - composer update
+
+script:
+    - ./vendor/bin/phpunit --coverage-clover=coverage.xml
+
+after_success:
+    - pip install --user codecov && codecov
+
+notifications:
+    email: false

README.md

@@ -1,6 +1,7 @@
 # Filesystem PSR-6 Cache pool 
 [![Gitter](https://badges.gitter.im/php-cache/cache.svg)](https://gitter.im/php-cache/cache?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 [![Latest Stable Version](https://poser.pugx.org/cache/filesystem-adapter/v/stable)](https://packagist.org/packages/cache/filesystem-adapter)
+[![codecov.io](https://codecov.io/github/php-cache/filesystem-adapter/coverage.svg?branch=master)](https://codecov.io/github/php-cache/filesystem-adapter?branch=master)
 [![Total Downloads](https://poser.pugx.org/cache/filesystem-adapter/downloads)](https://packagist.org/packages/cache/filesystem-adapter)
 [![Monthly Downloads](https://poser.pugx.org/cache/filesystem-adapter/d/monthly.png)](https://packagist.org/packages/cache/filesystem-adapter)
 [![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE)