replacing all occurrences of standarderror with runtimeerror because standarderror is too general and includes things like argument errors which aren't raised by myself so I don't want to catch them.
stuff is working for most tests now. just need to adjust tests in converter_spec and we're good to go.
Merge branch 'master' of github.com:/queirozfcom/rachinations

Conflicts:
	domain/exceptions/no_elements_matching_condition_error.rb
	domain/nodes/pool.rb