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-code-coverage/.travis.yml

@@ -1,21 +1,39 @@
 language: php
 
-php:
-    - 5.6
-    - 7.0
-    - nightly
-
 sudo: false
 
+php:
+  - 7.0
+  - 7.1
+  - 7.2
+  - master
+
+matrix:
+  allow_failures:
+    - php: master
+  fast_finish: true
+
+env:
+  matrix:
+    - DEPENDENCIES="high"
+    - DEPENDENCIES="low"
+  global:
+    - DEFAULT_COMPOSER_FLAGS="--no-interaction --no-ansi --no-progress --no-suggest"
+
 before_install:
-    - composer self-update
+  - composer self-update
+  - composer clear-cache
 
 install:
-    - travis_retry composer install --no-interaction --prefer-source
+  - 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:
+  - if [[ "$DRIVER" = 'phpdbg' ]]; then phpdbg -qrr vendor/bin/phpunit --coverage-clover=coverage.xml; fi
+  - if [[ "$DRIVER" = 'xdebug' ]]; then vendor/bin/phpunit --coverage-clover=coverage.xml; fi
 
-    - vendor/bin/phpunit --configuration build
+after_success:
+  - bash <(curl -s https://codecov.io/bash)
 
 notifications:
   email: false