fixed typo in grunt command for cli
fix old path to gruntfile
whoops, it should be the _project_ gruntfile, not the lineman one.
Revert pointing at the project Gruntfile, testing directory structure got
me confused.

This reverts commit 92e205eef01094dc3a063de5f64a1452010651c3.
run grunt with the built in gruntfile, but in the project's working directory (so config files get found)
Merge branch 'fix_lineman_grunt' of git://github.com/lygaret/lineman into lygaret-fix_lineman_grunt