Refactor slightly, move underscore port into external file.
Implement TMPL_ELSE and TMPL_ELSIF.
Implement TMPL_LOOP.
Implement expression cleaner.
Implement parseTemplate method.
TYPO.
Fix TMPL_UNLESS issue.
Add todo for TMPL_INCLUDE.
Replace double quotes with single quotes.
Implement TMPL_INCLUDE.
Move parser files into separate folder.