Adds patterns to the list of patterns ignored in the backtrace when a failure is output by rspec. Example:
config.ignore_backtrace_patterns /spork/, /shoulda/, "/some/weird/path/"
When quiet backtraces are turned on (default), this will exclude any lines that match any of the Regexps and Strings passed.
# File lib/spec/runner/configuration.rb, line 149 def ignore_backtrace_patterns(*patterns) @ignored_backtrace_patterns ||=  @ignored_backtrace_patterns += patterns end