1. add HtmlFormatterTest.java
    - for dependency bug that causes ArrayOutOfBoundException
2. normalize identifier and string_literal respectively.
    - the token of identifier is replaced by "__IDENT__"
    - the token of string literal is replaced by "__STRINGLITERAL__"
update .gitmodules
remove submodule
add DiffBasedWebTester
update dependency
delete unused files
clean up packages
Merge pull request #2 from tokichie/issues/1

Issues/1 is solved