Pass the line number after colon, instead of --line option

Fixes #84 (RSpec 3 support)
rspec-handle-error: mark both arguments as unused
Bump the version, mention the latest change

1.10, because 1.9 got broken on Marmalade in the process, and the
current Marmalade doesn't support removal.
rspec-imenu-generic-expression: support 'it' aliases