Master-v2 (#1)

- Reimplemented validator
- Added test coverage to PHPUnit
- Log failing test error in order to know where the error is
- Updated Travis test script
- Added composer.lock file to gitignore
- Removed valid_test csv from gitignore to fix failing build
- Updated error method to return success message when there are no errors
- Added Travis build and Codecov badge to the readme

.gitignore

@@ -1,7 +1,8 @@
 .idea/*
 vendor
 build
-test.xml
-test.json
-/sample.xml
-/sample.json
+composer.lock
+sample.json
+sample.xml
+valid_test.json
+valid_test.xml

.travis.yml

@@ -6,7 +6,8 @@ install:
   - composer install --no-interaction
 
 script:
-  - phpunit
+  - composer test
 
 after_success:
-    - bash <(curl -s https://codecov.io/bash)
+    - bash <(curl -s https://codecov.io/bash)
+