Merge branch 'release-2.2.3' into develop
Moves the shortcode code into its own class.
Code cleaning.
Removes get_post_snippet() that was deprecated in v2.1.
Updates getSnippet() to be able to use arrays for variables. Fixes #22
Code styling.
Adds POST_SNIPPETS_DISABLE_PHP global constant.
Bumps version number.
Updates pot file.
Updates changelog
Merge branch 'release-2.3'