Added a new method ``get_directory_map()`` to ``Zepto\FileLoader``
Added ``map_directory_to_array()`` to ``Zepto\Zepto`` to help with navigation link-making
Renamed ``Zepto\Zepto::map_directory_to_array()`` to ``get_sitemap()``
Removed ``base_dir`` option from Twig templates
Fix to get all header tags from content file
Deleted empty constructors in ``Zepto\FileLoader\PluginLoader`` and ``Zepto\FileWriter``
Fixed constant definition for ``ROOT_DIR`` in test bootstrap file
Fixed coverage tag for test class of ``Zepto\Router``
Added more test cases for ``Zepto\Zepto``
Added new options to config file
Merge branch 'develop' into feature/big-ass-nav-improvement
Merge branch 'feature/update-docs-n-tests' into feature/big-ass-nav-improvement
Merge branch 'feature/big-ass-nav-improvement' into develop