Somes fixes.

Don't create .project directory when creating project.
Change hook when killing emacs with function that check opened project
before close it.
Generate TAGS from project's language(s).

Use project-persist to set project's languages settings.

Project's languages must be comma-separated (is used as ctags
--languages option).

To show list of the ctags built-in language names you can execute `ctags
--list-languages` in your shell.