base_parse:ok!
add demo for encoding and traits
add losted files
add some demoes
file_parse:default construct
add loop test for default construct instance.
open file
dad_file_parse: test open function
parse_itorator:change operator ==  without friend
dad_parse_iterator: operator== not friend now
dad_file_parse: work ok after load data,a exception exists when use default construct.
dad_file_parse: begin() has error,now fix it.