Updated travis build scripts (from rspec-dev)
Merge pull request #755 from rspec/update-travis-build-scripts-2014-08-08-for-master

Updates from rspec-dev (2014-08-08)
Updated travis build scripts (from rspec-dev)
Merge pull request #757 from rspec/update-travis-build-scripts-2014-08-12-for-master

Updates from rspec-dev (2014-08-12)
Forwardport 3.0.4 release notes.

[ci skip]
Fixup changelog a bit.

[ci skip]
support thrice with at_least and at_most
support thrice for have_received
support for thrice for any_instance
changelog for #754
[skip ci]