Updated travis build scripts (from rspec-dev)
see if we still need rbx specific dependencies
Rework color_enabled
remove backtrace_cleaner
remove filename_pattern as an alias of pattern (choosen because pattern matches cli)
Merge pull request #1463 from rspec/update-travis-build-scripts-2014-03-29-for-master

Updates from rspec-dev (2014-03-29)
fixup color_enabled docs
Merge pull request #1464 from rspec/try_travis_without_rubysl

Try Travis RBX builds without specific gemfile dependencies
Merge pull request #1460 from rspec/remove_deprecated_config

Remove deprecated config
configure load time with formatters / reporter
base formatter describes capturing load time
reporting load time in base_text_formatter
Update start & summary notification with load time and use notifications to report load time
capture start time as early as possible
specify behaviour of no loadtime
enforce usage of load time in notifications
alternate implementation providing load_time to legacy formatters