Improve jdbc driver handling in liquibase script

Search for the mysql driver jar by a known name. If it isn't found,
attempt to install it to the user's local maven repo and then use it in the
liquibase command.
Remove need to integration test environment vars

Added function to default to http://localhost:8080/v1/schemas for cattle
url in integration tests so that an environmen variable no longer needs
set for integration tests to run locally.
Merge pull request #4 from cjellick/master

Improve liquibase db script and integration test environment vars