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/phpunit-mock-objects/.travis.yml

@@ -1,22 +1,34 @@
 language: php
 
-before_script:
-  - composer self-update
-  - composer install --no-interaction --prefer-source --dev
-
-script: ./vendor/bin/phpunit --configuration ./build/travis-ci.xml
+sudo: false
 
 php:
-  - 5.6
   - 7.0
-  - hhvm
+  - 7.1
+  - 7.2
+  - master
+
+env:
+  matrix:
+    - DEPENDENCIES="high"
+    - DEPENDENCIES="low"
+  global:
+    - DEFAULT_COMPOSER_FLAGS="--no-interaction --no-ansi --no-progress --no-suggest"
+
+before_install:
+  - composer self-update
+  - composer clear-cache
+
+install:
+  - if [[ "$DEPENDENCIES" = 'high' ]]; then travis_retry composer update $DEFAULT_COMPOSER_FLAGS; fi
+  - if [[ "$DEPENDENCIES" = 'low' ]]; then travis_retry composer update $DEFAULT_COMPOSER_FLAGS --prefer-lowest; fi
+
+script:
+  - ./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