Merge pull request #7 from luiges90/master

Add User Meta Manager
Merge pull request #8 from luiges90/master

Model: add Twig support for UserMetaManager
Add shortcode chain.
Add caption shortcode.
Add more caption tests.
Fix shortcode compiler pass.
Add caption shortcode service.
Add shortcode Twig extension.
Rename doShortcode to process.
Add wp_shortcode filter to README.md
Merge pull request #9 from kayue/shortcode

Support shortcode.
findPostFormatByPost now assume one format per post. Return standard by default.
parseAttributes method should always return an array.
Merge pull request #10 from luiges90/master

Bug fixes