Remove add_setting calls in backtrace_cleaner

this are now unneeded because we've defined instance methods that handle
these configuration options

Signed-off-by: Sam Phippen <samphippen@googlemail.com>
Kill deprecation warnings for new backtrace specs

This is done by either using the new backtrace_exclusion_patterns or
stubbing RSpec.warn_deprecation

Signed-off-by: Sam Phippen <samphippen@googlemail.com>
Fix failing html/text_mate formatter specs

Signed-off-by: Sam Phippen <samphippen@googlemail.com>