Replaced abcs to config.
Merge pull request #9074 from gaynetdinov/replace_undefined_abcs_to_config_variable

Undefined abcs variable inside structure:dump task.
Fix the CHANGELOG entry order [ci skip]
Install latest bundler on Travis.

Attempt to fix travis error on 1.8.7/1.9.2:

    $ bundle install --path vendor/bundle
    ERROR: Gem bundler is not installed, run `gem install bundler` first.

    The command "bundle install --path vendor/bundle" failed and exited
    with 127 during install.