Remove livereload middleware

For whatever reason it 1) works without it just fine and 2) doesn't
work with it anymore - the split concat and uglify steps somehow send
the livereload script into a hanging state which doesn't allow the
application to load. Exemplary strange.

Addendum to #444
Rename grunt reload-server to reloading-server

This is semantically a little bit better and doesn't lead to
misunderstandings that `grunt reload-server` could only be a one-time
command to reload the server.

Addendum to #444