remove old dsl class and test
add todo comment and new dsl plan comment.
add update tweet dsl spec.
implements tweet string context.
implements update method for tweet string context
refactoring: remove duplicate test.
implements user string context
refactoring: completion tweet string inlined.
implements UserAdder for add user to list dsl.
remove old dsl resource and method.
implements get user context method.
implements list name context.
refactoring string context class.
refactoring context getter with type class.
test code refactoring
refactoring DSL object to package object and ContextGetter to other file.
remove duplicate test.
implements to method on UserAdder class.
implement id prefix to user context.
implements list id prefix to list context.