Add pear modules, mail and net_smtp via composer (#93)

Add pear modules, mail and net_smtp via composer, remove php 5.6 build due to phpunit 6

lib/composer/vendor/phpunit/php-token-stream/.travis.yml

@@ -1,35 +1,26 @@
 language: php
 
 php:
-  - 5.3.3
-  - 5.3
-  - 5.4
-  - 5.5
-  - 5.6
   - 7.0
-  - hhvm
-
-matrix:
-  allow_failures:
-    - php: hhvm
+  - 7.1
+  - 7.2
+  - master
 
 sudo: false
 
 before_install:
   - composer self-update
+  - composer clear-cache
 
 install:
-  - travis_retry composer install --no-interaction --prefer-source
+  - travis_retry composer update --no-interaction --no-ansi --no-progress --no-suggest
 
 script:
-  - ./vendor/bin/phpunit --configuration ./build/phpunit.xml
+  - ./vendor/bin/phpunit --coverage-clover=coverage.xml
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)
 
 notifications:
   email: false
-  webhooks:
-    urls:
-      - https://webhooks.gitter.im/e/6668f52f3dd4e3f81960
-    on_success: always
-    on_failure: always
-    on_start: false