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-timer/.travis.yml

@@ -1,30 +1,27 @@
 language: php
 
 php:
-  - 5.3.3
   - 5.3
   - 5.4
   - 5.5
   - 5.6
   - 7.0
-  - nightly
-  - hhvm
+  - 7.0snapshot
+  - 7.1
+  - 7.1snapshot
+  - 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 --optimize-autoloader --prefer-stable
 
 script:
-  - ./vendor/bin/phpunit --bootstrap src/Timer.php tests
+  - ./vendor/bin/phpunit
 
 notifications:
   email: false
-  webhooks:
-    urls:
-      - https://webhooks.gitter.im/e/6668f52f3dd4e3f81960
-    on_success: always
-    on_failure: always
-    on_start: false
-