Create structure for LaTeX fragments.

src/parser/mod.rs

@@ -16,6 +16,7 @@ mod greater_element;
 mod horizontal_rule;
 mod keyword;
 mod latex_environment;
+mod latex_fragment;
 mod lesser_block;
 mod lesser_element;
 mod list;
@@ -73,6 +74,7 @@ pub use object::Bold;
 pub use object::Code;
 pub use object::Entity;
 pub use object::Italic;
+pub use object::LatexFragment;
 pub use object::Object;
 pub use object::OrgMacro;
 pub use object::PlainLink;