Changed primary key for Bag from bagname to auto incremented id column. Relevant changes at all other locations. Fixes #160
Merge branch 'master' into t160_bag_pk_changes
Added default value while creating a new column
Added default value for id column of bagaction table.
Modified test cases for bag pk changes
commented unwanted changes
Postgres integration with Travis CI. ref #186
Testing database configurations for travis postgres integration. ref #186
Deleted travis database config file for testing purpose.
Merge branch 't160_bag_pk_changes' into travis_postgres_integration
Test configs for postgresql db.
Merge pull request #187 from gwu-libraries/travis_postgres_integration

Travis postgres integration
Merge pull request #184 from gwu-libraries/t160_bag_pk_changes

T160 bag pk changes