Remove hardcoded libpng package and add module dependency

Author: mattheath

README.md

@@ -11,6 +11,7 @@ Requires the following boxen modules:
 * `libtool`
 * `pkgconfig`
 * `pcre`
+* `libpng`
 
 The following boxen modules are required if optional PHP extensions are used:
 

manifests/init.pp

@@ -10,6 +10,7 @@
   include libtool
   include pkgconfig
   include pcre
+  include libpng
 
   # Get rid of any pre-installed packages
   package { ['phpenv', 'php-build']: ensure => absent; }
@@ -61,7 +62,6 @@
       'gmp',
       'icu4c',
       'jpeg',
-      'libpng',
       'libevent',
       'mcrypt',
     ]:

spec/fixtures/Puppetfile

@@ -5,4 +5,5 @@ mod 'wget',      '1.0.0', :github_tarball => 'boxen/puppet-wget'
 mod 'autoconf',  '1.0.0', :github_tarball => 'boxen/puppet-autoconf'
 mod 'libtool',   '1.0.0', :github_tarball => 'boxen/puppet-libtool'
 mod 'pkgconfig', '1.0.0', :github_tarball => 'boxen/puppet-pkgconfig'
-mod 'pcre',      '1.0.0', :github_tarball => 'boxen/puppet-pcre'
+mod 'pcre',      '1.0.0', :github_tarball => 'boxen/puppet-pcre'
+mod 'libpng',    '1.0.0', :github_tarball => 'boxen/puppet-libpng'