Add feature file for --safe mode
Parse the --safe option
Update --safe feature that was incorrectly specified

Passes trivially atm, b/c it doesn't actually ues the flags
First-pass at getting EvalIn interpreter into place

It's still wrong at the moment, b/c it doesn't send code that will eval
correctly (needs to add the code from result since we can't require there)
Merge branch 'v3.0' into safe-mode

Need to update this to deal with the
EventStream rather than the json structures,
will fail specs until then.

Conflicts:
	lib/seeing_is_believing.rb
	lib/seeing_is_believing/binary/add_annotations.rb
	lib/seeing_is_believing/binary/parse_args.rb
	seeing_is_believing.gemspec
EvaluateWithEvalIn uses the event stream, all specs pass again