Merge branch 'refs/heads/release/0.2' into develop
Added Twig library
Added support for Twig templates in Renderer
Switched to initial Twig templates for default templates
Removed TextProcessor instance from Twig templates
Added typographic filters to Twig templates
Passed post title into post templates as page title
Escaped all variables in default template and processed appropriate typography
Set up standardised cache directory path
Updated default templates to use cleaner, hacky underscore-prefixed variable attribute names
Merge branch 'refs/heads/feature/twig-templates' into develop
Added missing license for Twig library
Updated Post to allow header metadata names without a value set
Created Template class and moved file-specific logic from Renderer
Refactored away unnecessary method in Renderer
Simplified process for rendering-then-writing a template in Renderer
Standardised the rendering process for arrays of Collection objects
Fixed incorrect variable name in base template
Added missing parameter comment to Renderer method
Cached Templates in Renderer