Report error location in skewer-repl

This change adds line with file name and column where error is reported. 

It takes advantage of emacs built-in compilation error highlighting. If you set up 'skewer-path-strip-level' and 'compilation-search-path' right according to your project, you will be even able to clik on error line in skewer-repl buffer, and you will be taken to file and line where error occurred. Very useful if you do TDD style development.