Target Ruby 2.1.1, bumping debugger

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Remove now deprecated .rvmrc

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Target Ruby 2.1.1 on Travis

Signed-off-by: Alex Coles <alex@alexbcoles.com>