This commit adds the php-json package.

The json features of php have been moved to a separate package in the following distributions:
  - Debian >= 8 (jessie)
  - Ubuntu >= 13.04

Changes:
  - Added json.sls
  - Updated map.jinja
  - Updated README.md

README.rst

 
 Installs the php-imap package.
 
+``php.json``
+------------
+
+Installs the php-json package.
+
 ``php.ldap``
 ------------
 

php/json.sls

+{% from "php/map.jinja" import php with context %}
+
+php-json:
+  pkg:
+    - installed
+    - name: {{ php.json_pkg }}

php/map.jinja

         'curl_pkg': 'php5-curl',
         'fpm_pkg': 'php5-fpm',
         'gd_pkg': 'php5-gd',
+        'json_pkg': 'php5-json',
         'mbstring_pkg': 'php5',
         'mcrypt_pkg': 'php5-mcrypt',
         'memcache_pkg': 'php5-memcache',
         'curl_pkg': 'curl',
         'fpm_pkg': 'php-fpm',
         'gd_pkg': 'php-gd',
+        'json_pkg': 'php-common',
         'mbstring_pkg': 'php-mbstring',
         'mcrypt_pkg': 'php-mcrypt',
         'memcache_pkg': 'php-pecl-memcache',