alternate exposing of config variables

Conflicts:
	lib/rspec/core/configuration.rb
specify a docstring for the spec
add linebreaks
Remove redundant spec
suggested specify/it changes and linebreak from @myronmarston in #874
reword doc strings
bring in support for the new backtrace cleaner
add specs for the reader of backtrace cleaner state
line breaks
making line numbers symetrical in terms of config reading
making full description symetrical in terms of config reading
updating specs to remove deprecations
record only the libs we've added to the load path