Deal with old version of rspec

the version required by sequel is too old and doesn't have /formatters
just fall back to documentation formatter for now
Two new options EXPECTED_FAILURES and SHOW_PASSING

EXPECTED_FAILIURES -> to track changes in what's failing puts a new
message if something in that list passes, or not in that list fails
SHOW_PASSING -> if false just prints out a . for passing specs
print out how the spec is being limited
only print new failures if there are expected ones