add lr
fix check left recursion
fix PegString and PegCharacter
add pegClone
fix parsePegNode meoization
updated bun.peg
merge
adding renewal BunType
renewal type system
merge
reduce left recursion
fix string bug
Merge pull request #12 from shun-honda/memoization

Memoization
Merge pull request #13 from nikuuchi/python

update python parser
add --profile argument. print memory usage, parse time
bugs fixed at typed
Merge pull request #14 from imasahiro/support_profile_mode

add --profile mode
Merge branch 'master' of github.com:libbun/libbun2
update bun grammar
refactoring PegParserContext