Merge branch 'release-0.4.2' into develop
Make watchr script just run specs, support notify

We can have a separate script for features. Also use gnome's notify-send
if it is available.
Smarter grokking of which spec to run for a given file in lib
Comment for rspec_opts
Signal traps for QUIT and INT
Merge branch 'watchr-enhance' into develop
Incorporate features into same watchr file anyway

Also nicer Ctrl-C handler that quits if invoked twice, else runs
everything.
Remove rcov from rubinius development gems
Merge branch 'rbx-fixes' into develop
Update to recent versions of gems
Version bump to 0.5.0
Update gemspec with new dependencies and version
Merge branch 'release/0.5.0'

* release/0.5.0:
  Update gemspec with new dependencies and version
  Version bump to 0.5.0
  Update to recent versions of gems
  Remove rcov from rubinius development gems
  Incorporate features into same watchr file anyway
  Signal traps for QUIT and INT
  Comment for rspec_opts
  Smarter grokking of which spec to run for a given file in lib
  Make watchr script just run specs, support notify