Fix deprecation (and formatter problem) in RSpec 2.14

RSpec 2.14 has both `backtrace_clean_patterns` and `backtrace_exclusion_patterns`. Using the former generates a deprecation message, which somehow also disables the textmate formatter.
Merge branch 'use-binstub-if-present' into all-of-it
Merge branch 'fix-for-rspec3' into all-of-it