Missing bootstrap spec files
Char#upcase
Char#downcase
Removed wrong files
String#upcase and String#downcase
Missing code
String#capitalize and fixed downcase and upcase
String#empty?
Lex '\r'
String#chomp
Lex '\v' and '\f'
Char#whitespace?
Lex \v and \f inside string
String#strip
Fixed bug in String#chomp
String#rstrp and String#lstrip
Bootstrap lexer lexes \f,\r and \v
Some refactors to create strings more easily