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/myclabs/deep-copy/.travis.yml

@@ -1,30 +1,33 @@
 language: php
 
+sudo: false
+
 php:
-  - '5.5'
   - '5.6'
   - '7.0'
   - '7.1'
   - nightly
-  - hhvm
 
 matrix:
   fast_finish: true
   include:
-    - php: '5.4'
+    - php: '5.6'
       env: COMPOSER_FLAGS="--prefer-lowest"
   allow_failures:
     - php: nightly
-    - php: hhvm
+
+cache:
+  directories:
+    - $HOME/.composer/cache/files
 
 before_install:
   - |
-    if [ "$TRAVIS_PHP_VERSION" = "nightly" ] || "$TRAVIS_PHP_VERSION" = "7.1" ]; then
+    if [ "$TRAVIS_PHP_VERSION" = "nightly" ]; then
       COMPOSER_FLAGS="$COMPOSER_FLAGS --ignore-platform-reqs"
     fi;
 
 install:
-  - composer update -n --prefer-dist $COMPOSER_FLAGS
+  - composer update --no-interaction --no-progress --no-suggest --prefer-dist $COMPOSER_FLAGS
   - wget https://github.com/satooshi/php-coveralls/releases/download/v1.0.0/coveralls.phar
 
 before_script: