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/consolidation/config/CHANGELOG.md

@@ -0,0 +1,30 @@
+# Changelog
+
+### 1.0.6 10/17/2017
+
+* Add a 'Config::combine()' method for importing without overwriting.
+* Factor out ArrayUtil as a reusable utility class.
+
+### 1.0.4 10/16/2017
+
+* BUGFIX: Go back to injecting boolean options only if their value is 'true'.
+
+### 1.0.3 10/04/2017
+
+* Add an EnvConfig utility class.
+* BUGFIX: Fix bug in envKey calculation: it was missing its prefix.
+* BUGFIX: Export must always return something.
+* BUGFIX: Pass reference array through to Expander class.
+
+### 1.0.2 09/16/2017
+
+* BUGFIX: Allow global boolean options to have either `true` or `false` initial values.
+
+### 1.0.1 07/28/2017
+
+* Inject default values into InputOption objects when 'help' command executed.
+
+### 1.0.0 06/28/2017
+
+* Initial release
+