add test_helper method compile_headline
fix escape; do escape only for Regexp pattern to avoid double escaping
fix highlight; do not escaping withoug highlighting
Contents in BlockElement should be escaped
fix inline symtax
refactor BlockElementParagraph (remove instance variable)
fix some LATEXBuilder error (WIP)
fix I18n test
fix inline syntax; parsing args should be done in compiler, not builders
fix compiler tests
fix idgxmlbuilder
fix inaobuilder
fix tests of htmlbuilder; use copmile_inline instead of compile_href
fix tests for lineinput; remove unused methods
fix tests for markdownbuilder
remove unused method
fix test for builder; print/puts are not used, inline parsing is moved from builder to compiler