Handle text and headers
Remove extra debug
Fix misplaced '+' operator
Add header (atx)
Add ast module
Update lexer + Add parser + Update makefile

This commit handles:
- p
- ul
- h[1-6]
- hr
[test] Update Makefile

The include of the .depend is not triggered anymore for
every rules of the Makefile
[test] Add test case
Add little script to start the test
Update gitignore