Merge branch 'refs/heads/release/0.6' into develop
Created initial Theme class
Added Theme loader to Package Manager
Changed templates directory in config to themes
Added sitewide Theme to Blog
Updated Theme to facilitate rendering templates
Updated Renderer to allow Themes to implement handlers for specific templates
Updated File System to allow preservation of file attributes
Added copying theme assets to build flow
Mapped theme assets in .htaccess
Updated packages builder to build themes
Fixed incorrect namespace usage for packages
Moved default templates to new default theme
Added themes documentation
Added license URL to default theme config
Moved feed and sitemap templates outside of Theme responsibilities
Moved feed customisation to hook
Simplified inbuilt XML template helper methods
Merge branch 'refs/heads/feature/themes' into develop
Added minimum version checker to Package Manager