simple gem
support Prestige
reorganize files
Prestige: ABS
Prestige: ABY
define nil.text as empty string
reorganize files
AKO3: AKO
refactor codes
refactor tests
refactor tests
capsulate fixture constants in namespace
refactor to use active_support
refactor tests
fix tests
refine fixtures
Waap: AIR
patch ChronicDuration
Hash.new_with_keys
fill empty fields