Add travis configuration

.travis.yml

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+language: ruby
+
+rvm:
+  - 2.4.1
+  - 2.3.4
+  - 2.2.7
+
+gemfile:
+  - $REDMINE_PATH/Gemfile
+
+env:
+  - REDMINE_VER=3.4-stable DB=postgresql
+  # - REDMINE_VER=master
+
+sudo: true
+
+addons:
+  postgresql: "9.6"
+
+before_install:
+  - export PLUGIN_NAME=redmine_messenger
+  - export REDMINE_PATH=$HOME/redmine
+  - export REDMINE_GIT_REPO=git://github.com/redmine/redmine.git
+  - git clone $REDMINE_GIT_REPO $REDMINE_PATH
+  - if [[ "$REDMINE_VER" == "master" ]]; then wget https://www.redmine.org/attachments/download/21044/use_migration_context_with_test2.patch; fi
+  - if [[ "$REDMINE_VER" == "master" ]]; then patch -p0 < use_migration_context_with_test2.patch; fi
+  - if [[ "$REDMINE_VER" != "master" ]]; then git checkout -b $REDMINE_VER origin/$REDMINE_VER; fi
+  - ln -s $TRAVIS_BUILD_DIR $REDMINE_PATH/plugins/$PLUGIN_NAME
+  - cp test/support/additional_environment.rb $REDMINE_PATH/config/
+  - cp test/support/database-$DB-travis.yml $REDMINE_PATH/config/database.yml
+  - cd $REDMINE_PATH
+
+before_script:
+  # - bundle exec rake redmine:load_default_data REDMINE_LANG=en
+  # - bundle exec rake db:structure:dump
+  - bundle exec rake db:create
+  - bundle exec rake db:migrate
+  - bundle exec rake redmine:plugins:migrate
+
+script:
+  - if [[ "$REDMINE_VER" == "master" ]]; then bundle exec rake redmine:plugins:test:units NAME=$PLUGIN_NAME; fi
+  - if [[ "$REDMINE_VER" == "master" ]]; then bundle exec rake redmine:plugins:test:functionals NAME=$PLUGIN_NAME; fi
+  - if [[ "$REDMINE_VER" == "master" ]]; then bundle exec rake redmine:plugins:test:integration NAME=$PLUGIN_NAME; fi
+  - if [[ "$REDMINE_VER" != "master" ]]; then bundle exec rake redmine:plugins:test NAME=$PLUGIN_NAME RUBYOPT="-W0"; fi

test/support/additional_environment.rb

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+# for travis debugging
+# config.logger = Logger.new(STDOUT)
+# config.logger.level = Logger::INFO
+# config.log_level = :info
+

test/support/database_postgresql_travis.yml

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+test:
+  adapter: postgresql
+  encoding: unicode
+  pool: 5
+  database: travis_ci_test
+  user: postgres
+
+