Use maintenance-branch in Gemfile.
Merge pull request #569 from rspec/use-maint-branch-master

Use maintenance-branch in Gemfile.
dont treat structs as arrays when generating descriptions
changelog for #576
[skip ci]
Merge pull request #576 from rspec/fix_diffs_for_structs

Don't treat Structs as enumerable when generating description.
Fix constant casing.
Port changelog from 3.0.1 release.

[ci skip]
Add changelog entry for #563.

[ci skip]
Disable monkey patching.

Most of this conversion was done with transpec, but I had to
discard some of its changes by hand since we test some
deprecated/disallowed things here.
Merge two example groups.

No need to have two example groups for PositiveExpectationHandler.
Merge pull request #579 from rspec/disable-monkey-patching

Disable monkey patching
Bump version to 3.1.0.pre to prevent confusion with master being 3.0.0 but 3.0.x releases are out.
Fix regression in `contain_exactly`.

The new implementation in 3.0.0 allowed this to pass:

expect([1]).to contain_exactly()

The problem was that the `actual_matches` hash was lazily
initialized in an `expected.each_with_index` loop. This
meant that if `expected` was empty, `actual_matches` would
be made empty as well, causing the match logic to pass.

Fixes #581.
Merge pull request #582 from rspec/fix-contain-exactly-regression

Fix regression in `contain_exactly`.
Add more helpful error message for `change`.

When change was called with a single argument and no block, the
message to be sent to the receiver defaulted to nil, causing an
unclear failure message.

Fixes #584.
Merge pull request #585 from AgentAntelope/master

Add more helpful error message for `change`.
Changelog for #585.

[ci skip]
Merge branch 'master' of github.com:rspec/rspec-expectations into add_have_attributes_matcher