Make a public, non-snapshot release of liquibase-impala

[turu]

As a user, I would like to be able to:

1. Declare dependency in pom of my project, on a non-snapshot version of liquibase-impala, accessible in a public Maven repo without any installation steps required - assuming that I also separately declare dependency on any Hive/Impala driver I like.
2. Download a binary release of liquibase-impala from Github and start using it without any additional steps required - assuming that I also separately put any Hive/Impala driver I like on the classpath.

Depends on: #2, #3, #5, #6

[connect2manu]

+1